Merge pull request #939 from elevatormind/backtrace-windows-disable

Fix issue #937
Fix Draw the folio with inverted lightness on a dark palette- #954
2026-09-20 15:24:14 +02:00 · 2026-09-20 14:03:43 +02:00 · 2026-09-20 13:07:57 +02:00 · 2026-09-20 13:05:38 +02:00 · 2026-09-20 13:05:13 +02:00 · 2026-09-20 12:48:10 +02:00
72 changed files with 2553 additions and 315 deletions
@@ -8,3 +8,11 @@ doc/*
 QElectroTech.tag
 !doc/doc-utils
 lang/*.qm
+
+# -- IDE settings/intermediate files --
+# zed
+.zed
+.cache
+
+# VS Code
+.vscode
@@ -113,7 +113,9 @@ if(Backtrace_FOUND)
    include_directories(${Backtrace_INCLUDE_DIRS})
    add_compile_definitions(QET_CRASH_BACKTRACE)
 else()
-    message(STATUS "backtrace() not available: crash dumps will carry the log ring without a backtrace")
+    message(STATUS
+        "backtrace() not available: crash dumps will carry the log ring "
+        "without a backtrace")
 endif()

 find_package(SQLite3 REQUIRED)
@@ -271,6 +271,22 @@ mkdir build && cd build
 cmake .. -G Ninja -DBUILD_WITH_KF=OFF -DCMAKE_BUILD_TYPE=Release
 cmake --build .
 ```
+
+If `libbacktrace` is installed in your MSYS2 environment, pass the following
+cached CMake variables when configuring. They are only necessary in that
+case, because `FindBacktrace` needs them to locate the library:
+
+```sh
+cmake .. -G Ninja -DBUILD_WITH_KF=OFF -DCMAKE_BUILD_TYPE=Release \
+    -DBacktrace_INCLUDE_DIR=/c/msys64/clang64/include \
+    -DBacktrace_LIBRARY=/c/msys64/clang64/lib/libbacktrace.a
+```
+
+`Backtrace_INCLUDE_DIR` must point to the directory containing `backtrace.h`,
+and `Backtrace_LIBRARY` to the `libbacktrace.a` file. The paths above are the
+usual locations for the MSYS2 `clang64` environment; adjust them if your
+installation uses a different prefix.
+
 (KF6 isn't packaged in MSYS2 either, hence `-DBUILD_WITH_KF=OFF` again.)

 Using the Qt Online Installer's bundled MinGW kit instead: point
@@ -248,8 +248,12 @@ set(QET_SRC_FILES
  ${QET_DIR}/sources/qet.h
  ${QET_DIR}/sources/qeticons.cpp
  ${QET_DIR}/sources/qeticons.h
+  ${QET_DIR}/sources/palettegraphicsview.cpp
+  ${QET_DIR}/sources/palettegraphicsview.h
  ${QET_DIR}/sources/qetpalette.cpp
  ${QET_DIR}/sources/qetpalette.h
+  ${QET_DIR}/sources/qetstyle.cpp
+  ${QET_DIR}/sources/qetstyle.h
  ${QET_DIR}/sources/qetinformation.cpp
  ${QET_DIR}/sources/qetinformation.h
  ${QET_DIR}/sources/qetmainwindow.cpp
@@ -434,6 +438,8 @@ set(QET_SRC_FILES
  ${QET_DIR}/sources/ElementsCollection/elementcollectionhandler.h
  ${QET_DIR}/sources/ElementsCollection/elementcollectionitem.cpp
  ${QET_DIR}/sources/ElementsCollection/elementcollectionitem.h
+  ${QET_DIR}/sources/ElementsCollection/elementpreviewdelegate.cpp
+  ${QET_DIR}/sources/ElementsCollection/elementpreviewdelegate.h
  ${QET_DIR}/sources/ElementsCollection/elementscollectionmodel.cpp
  ${QET_DIR}/sources/ElementsCollection/elementscollectionmodel.h
  ${QET_DIR}/sources/ElementsCollection/elementscollectionwidget.cpp
@@ -699,6 +705,8 @@ set(QET_SRC_FILES
  ${QET_DIR}/sources/ui/contactgroupselectiondialog.h
  ${QET_DIR}/sources/ui/conductorpropertiesdialog.cpp
  ${QET_DIR}/sources/ui/conductorpropertiesdialog.h
+  ${QET_DIR}/sources/ui/conductorcolortoolbutton.cpp
+  ${QET_DIR}/sources/ui/conductorcolortoolbutton.h
  ${QET_DIR}/sources/ui/conductorpropertieswidget.cpp
  ${QET_DIR}/sources/ui/conductorpropertieswidget.h
  ${QET_DIR}/sources/ui/configsaveloaderwidget.cpp
@@ -216,6 +216,8 @@ Clarification:
    ico/128x128/diagram.png by the QElectroTech team (License CC BY-ND 3.0)
    ico/128x128/document-export.png by the QElectroTech team (License CC BY-ND 3.0)
    ico/128x128/project.png by the QElectroTech team (License CC BY-ND 3.0)
+    ico/scalable/pdf-import.svg by Jeff Patterson from the QElectroTech team (License CC BY-ND 3.0), laid out like ico/22x22/insert-image.png
+    ico/scalable/diagram.svg, folio-new.svg, folio-delete.svg, folio-properties.svg, label.svg by Jeff Patterson from the QElectroTech team (License CC BY-ND 3.0), the folio icons redrawn in the same style
    ico/256x256/* by Nuri from the QElectroTech team (License CC BY-ND 3.0)
    ico/breeze-icons/* by Nuri from the QElectroTech team (License CC BY-ND 3.0)
    ico/diagram.png by Nuri from the QElectroTech team (License CC BY-ND 3.0)
@@ -148,15 +148,8 @@
        <file alias="themes/qet/22x22/conductor-reset.png">22x22/conductor2.png</file>
        <file alias="themes/qet/22x22/configure-toolbars.png">22x22/configure-toolbars.png</file>
        <file alias="themes/qet/22x22/configure.png">22x22/configure.png</file>
-        <file alias="themes/qet/22x22/diagram.png">22x22/diagram.png</file>
-        <file alias="themes/qet/22x22/diagram_add.png">22x22/diagram_add.png</file>
-        <file alias="themes/qet/22x22/folio-new.png">22x22/diagram_add.png</file>
        <file alias="themes/qet/22x22/diagram_bg.png">22x22/diagram_bg.png</file>
-        <file alias="themes/qet/22x22/diagram_del.png">22x22/diagram_del.png</file>
-        <file alias="themes/qet/22x22/folio-delete.png">22x22/diagram_del.png</file>
        <file alias="themes/qet/22x22/dialog-cancel.png">22x22/dialog-cancel.png</file>
-        <file alias="themes/qet/22x22/dialog-information.png">22x22/dialog-information.png</file>
-        <file alias="themes/qet/22x22/folio-properties.png">22x22/dialog-information.png</file>
        <file alias="themes/qet/22x22/dialog-ok.png">22x22/dialog-ok.png</file>
        <file alias="themes/qet/22x22/document-close.png">22x22/document-close.png</file>
        <file alias="themes/qet/22x22/document-export.png">22x22/document-export.png</file>
@@ -207,7 +200,6 @@
        <file alias="themes/qet/22x22/guides.png">22x22/guides.png</file>
        <file alias="themes/qet/22x22/hotspot.png">22x22/hotspot.png</file>
        <file alias="themes/qet/22x22/insert-image.png">22x22/insert-image.png</file>
-        <file alias="themes/qet/22x22/label.png">22x22/label.png</file>
        <file alias="themes/qet/22x22/landscape.png">22x22/landscape.png</file>
        <file alias="themes/qet/22x22/line.png">22x22/line.png</file>
        <file alias="themes/qet/22x22/list-add.png">22x22/list-add.png</file>
@@ -218,7 +210,6 @@
        <file alias="themes/qet/22x22/object-locked.png">22x22/object-locked.png</file>
        <file alias="themes/qet/22x22/object-rotate-right.png">22x22/object-rotate-right.png</file>
        <file alias="themes/qet/22x22/object-unlocked.png">22x22/object-unlocked.png</file>
-        <file alias="themes/qet/22x22/pdf-import.png">22x22/pdf-import.png</file>
        <file alias="themes/qet/22x22/polygon.png">22x22/polygon.png</file>
        <file alias="themes/qet/22x22/portrait.png">22x22/portrait.png</file>
        <file alias="themes/qet/22x22/preferences-desktop-user.png">22x22/preferences-desktop-user.png</file>
@@ -274,6 +265,12 @@
        <file alias="themes/qet/128x128/printer.png">128x128/printer.png</file>
        <file alias="themes/qet/128x128/project.png">128x128/project.png</file>
        <file alias="themes/qet/128x128/settings.png">128x128/settings.png</file>
+        <file alias="themes/qet/scalable/diagram.svg">scalable/diagram.svg</file>
+        <file alias="themes/qet/scalable/folio-delete.svg">scalable/folio-delete.svg</file>
+        <file alias="themes/qet/scalable/folio-new.svg">scalable/folio-new.svg</file>
+        <file alias="themes/qet/scalable/folio-properties.svg">scalable/folio-properties.svg</file>
+        <file alias="themes/qet/scalable/label.svg">scalable/label.svg</file>
+        <file alias="themes/qet/scalable/pdf-import.svg">scalable/pdf-import.svg</file>
        <file alias="themes/qet/scalable/edit-opacity.svg">breeze-icons/scalable/apps/hidef/edit-opacity.svg</file>
        <file alias="themes/qet/scalable/image-flip-horizontal.svg">breeze-icons/scalable/apps/hidef/image-flip-horizontal-symbolic.svg</file>
        <file alias="themes/qet/scalable/image-flip-vertical.svg">breeze-icons/scalable/apps/hidef/image-flip-vertical-symbolic.svg</file>
@@ -290,7 +287,6 @@
        <file>themes/qet-dark/16x16/conductor-edit.png</file>
        <file>themes/qet-dark/16x16/configure-toolbars.png</file>
        <file>themes/qet-dark/16x16/configure.png</file>
-        <file>themes/qet-dark/16x16/diagram.png</file>
        <file>themes/qet-dark/16x16/dialog-cancel.png</file>
        <file>themes/qet-dark/16x16/dialog-ok.png</file>
        <file>themes/qet-dark/16x16/document-export.png</file>
@@ -331,9 +327,6 @@
        <file>themes/qet-dark/16x16/folder-open.png</file>
        <file>themes/qet-dark/16x16/folder-show-all.png</file>
        <file>themes/qet-dark/16x16/folder.png</file>
-        <file>themes/qet-dark/16x16/folio-delete.png</file>
-        <file>themes/qet-dark/16x16/folio-new.png</file>
-        <file>themes/qet-dark/16x16/folio-properties.png</file>
        <file>themes/qet-dark/16x16/folio-ref-coming.png</file>
        <file>themes/qet-dark/16x16/go-company.png</file>
        <file>themes/qet-dark/16x16/go-down-double.png</file>
@@ -348,7 +341,6 @@
        <file>themes/qet-dark/16x16/item-copy.png</file>
        <file>themes/qet-dark/16x16/item-move.png</file>
        <file>themes/qet-dark/16x16/kdenlive-show-video.png</file>
-        <file>themes/qet-dark/16x16/label.png</file>
        <file>themes/qet-dark/16x16/list-add.png</file>
        <file>themes/qet-dark/16x16/list-remove.png</file>
        <file>themes/qet-dark/16x16/masquer.png</file>
@@ -381,15 +373,7 @@
        <file>themes/qet-dark/22x22/arrow-right.png</file>
        <file>themes/qet-dark/22x22/configure-toolbars.png</file>
        <file>themes/qet-dark/22x22/configure.png</file>
-        <file>themes/qet-dark/22x22/diagram.png</file>
-        <file>themes/qet-dark/22x22/diagram_add.png</file>
-        <file>themes/qet-dark/22x22/folio-new.png</file>
-        <file>themes/qet-dark/22x22/diagram_bg.png</file>
-        <file>themes/qet-dark/22x22/diagram_del.png</file>
-        <file>themes/qet-dark/22x22/folio-delete.png</file>
        <file>themes/qet-dark/22x22/dialog-cancel.png</file>
-        <file>themes/qet-dark/22x22/dialog-information.png</file>
-        <file>themes/qet-dark/22x22/folio-properties.png</file>
        <file>themes/qet-dark/22x22/dialog-ok.png</file>
        <file>themes/qet-dark/22x22/document-export.png</file>
        <file>themes/qet-dark/22x22/document-import.png</file>
@@ -425,7 +409,6 @@
        <file>themes/qet-dark/22x22/go-up.png</file>
        <file>themes/qet-dark/22x22/grid.png</file>
        <file>themes/qet-dark/22x22/insert-image.png</file>
-        <file>themes/qet-dark/22x22/label.png</file>
        <file>themes/qet-dark/22x22/landscape.png</file>
        <file>themes/qet-dark/22x22/line.png</file>
        <file>themes/qet-dark/22x22/list-add.png</file>
@@ -436,7 +419,6 @@
        <file>themes/qet-dark/22x22/object-locked.png</file>
        <file>themes/qet-dark/22x22/object-rotate-right.png</file>
        <file>themes/qet-dark/22x22/object-unlocked.png</file>
-        <file>themes/qet-dark/22x22/pdf-import.png</file>
        <file>themes/qet-dark/22x22/polygon.png</file>
        <file>themes/qet-dark/22x22/portrait.png</file>
        <file>themes/qet-dark/22x22/preferences-desktop-user.png</file>
@@ -472,8 +454,13 @@
        <file>themes/qet-dark/48x48/user-away.png</file>
        <file>themes/qet-dark/48x48/view-pim-journal.png</file>
        <file>themes/qet-dark/128x128/plasmagik.png</file>
-        <file>themes/qet-dark/128x128/printer.png</file>
        <file>themes/qet-dark/128x128/settings.png</file>
+        <file>themes/qet-dark/scalable/diagram.svg</file>
+        <file>themes/qet-dark/scalable/folio-delete.svg</file>
+        <file>themes/qet-dark/scalable/folio-new.svg</file>
+        <file>themes/qet-dark/scalable/folio-properties.svg</file>
+        <file>themes/qet-dark/scalable/label.svg</file>
+        <file>themes/qet-dark/scalable/pdf-import.svg</file>
        <file>themes/qet-dark/scalable/edit-opacity.svg</file>
        <file>themes/qet-dark/scalable/image-flip-horizontal.svg</file>
        <file>themes/qet-dark/scalable/image-flip-vertical.svg</file>
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#4d4d4d;
+      }
+      </style>
+  </defs>
+  <g transform="translate(1,1)">
+  <path style="fill:currentColor;fill-opacity:1;stroke:none" d="M 3 5 h 1 v 1 h -1 Z M 3 6 h 1 v 1 h -1 Z M 3 7 h 1 v 1 h -1 Z M 3 8 h 1 v 1 h -1 Z M 3 9 h 1 v 1 h -1 Z M 3 10 h 1 v 1 h -1 Z M 3 11 h 1 v 1 h -1 Z M 3 12 h 1 v 1 h -1 Z M 3 13 h 1 v 1 h -1 Z M 3 14 h 1 v 1 h -1 Z M 3 15 h 1 v 1 h -1 Z M 3 16 h 1 v 1 h -1 Z M 4 5 h 1 v 1 h -1 Z M 4 13 h 1 v 1 h -1 Z M 4 16 h 1 v 1 h -1 Z M 5 5 h 1 v 1 h -1 Z M 5 13 h 1 v 1 h -1 Z M 5 16 h 1 v 1 h -1 Z M 6 5 h 1 v 1 h -1 Z M 6 13 h 1 v 1 h -1 Z M 6 16 h 1 v 1 h -1 Z M 7 5 h 1 v 1 h -1 Z M 7 13 h 1 v 1 h -1 Z M 7 16 h 1 v 1 h -1 Z M 8 5 h 1 v 1 h -1 Z M 8 13 h 1 v 1 h -1 Z M 8 16 h 1 v 1 h -1 Z M 9 5 h 1 v 1 h -1 Z M 9 13 h 1 v 1 h -1 Z M 9 16 h 1 v 1 h -1 Z M 10 5 h 1 v 1 h -1 Z M 10 13 h 1 v 1 h -1 Z M 10 16 h 1 v 1 h -1 Z M 11 5 h 1 v 1 h -1 Z M 11 13 h 1 v 1 h -1 Z M 11 14 h 1 v 1 h -1 Z M 11 15 h 1 v 1 h -1 Z M 11 16 h 1 v 1 h -1 Z M 12 5 h 1 v 1 h -1 Z M 12 13 h 1 v 1 h -1 Z M 12 16 h 1 v 1 h -1 Z M 13 5 h 1 v 1 h -1 Z M 13 13 h 1 v 1 h -1 Z M 13 16 h 1 v 1 h -1 Z M 14 5 h 1 v 1 h -1 Z M 14 13 h 1 v 1 h -1 Z M 14 16 h 1 v 1 h -1 Z M 15 5 h 1 v 1 h -1 Z M 15 13 h 1 v 1 h -1 Z M 15 16 h 1 v 1 h -1 Z M 16 5 h 1 v 1 h -1 Z M 16 13 h 1 v 1 h -1 Z M 16 16 h 1 v 1 h -1 Z M 17 5 h 1 v 1 h -1 Z M 17 13 h 1 v 1 h -1 Z M 17 16 h 1 v 1 h -1 Z M 18 5 h 1 v 1 h -1 Z M 18 6 h 1 v 1 h -1 Z M 18 7 h 1 v 1 h -1 Z M 18 8 h 1 v 1 h -1 Z M 18 9 h 1 v 1 h -1 Z M 18 10 h 1 v 1 h -1 Z M 18 11 h 1 v 1 h -1 Z M 18 12 h 1 v 1 h -1 Z M 18 13 h 1 v 1 h -1 Z M 18 14 h 1 v 1 h -1 Z M 18 15 h 1 v 1 h -1 Z M 18 16 h 1 v 1 h -1 Z" class="ColorScheme-Text"/>
+  </g>
+</svg>
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#4d4d4d;
+      }
+      </style>
+  </defs>
+  <g transform="translate(1,1)">
+  <path style="fill:currentColor;fill-opacity:1;stroke:none" d="M 3 5 h 1 v 1 h -1 Z M 3 6 h 1 v 1 h -1 Z M 3 7 h 1 v 1 h -1 Z M 3 8 h 1 v 1 h -1 Z M 3 9 h 1 v 1 h -1 Z M 3 10 h 1 v 1 h -1 Z M 3 11 h 1 v 1 h -1 Z M 3 12 h 1 v 1 h -1 Z M 3 13 h 1 v 1 h -1 Z M 3 14 h 1 v 1 h -1 Z M 3 15 h 1 v 1 h -1 Z M 3 16 h 1 v 1 h -1 Z M 4 5 h 1 v 1 h -1 Z M 4 13 h 1 v 1 h -1 Z M 4 16 h 1 v 1 h -1 Z M 5 5 h 1 v 1 h -1 Z M 5 13 h 1 v 1 h -1 Z M 5 16 h 1 v 1 h -1 Z M 6 5 h 1 v 1 h -1 Z M 6 13 h 1 v 1 h -1 Z M 6 16 h 1 v 1 h -1 Z M 7 5 h 1 v 1 h -1 Z M 7 13 h 1 v 1 h -1 Z M 7 16 h 1 v 1 h -1 Z M 8 5 h 1 v 1 h -1 Z M 8 13 h 1 v 1 h -1 Z M 8 16 h 1 v 1 h -1 Z M 9 5 h 1 v 1 h -1 Z M 9 13 h 1 v 1 h -1 Z M 9 16 h 1 v 1 h -1 Z M 10 5 h 1 v 1 h -1 Z M 10 13 h 1 v 1 h -1 Z M 10 16 h 1 v 1 h -1 Z M 11 5 h 1 v 1 h -1 Z M 11 13 h 1 v 1 h -1 Z M 11 14 h 1 v 1 h -1 Z M 11 15 h 1 v 1 h -1 Z M 11 16 h 1 v 1 h -1 Z M 12 5 h 1 v 1 h -1 Z M 12 13 h 1 v 1 h -1 Z M 12 16 h 1 v 1 h -1 Z M 13 5 h 1 v 1 h -1 Z M 14 5 h 1 v 1 h -1 Z M 14 17 h 1 v 1 h -1 Z M 15 5 h 1 v 1 h -1 Z M 15 17 h 1 v 1 h -1 Z M 16 5 h 1 v 1 h -1 Z M 16 17 h 1 v 1 h -1 Z M 17 5 h 1 v 1 h -1 Z M 17 17 h 1 v 1 h -1 Z M 18 5 h 1 v 1 h -1 Z M 18 6 h 1 v 1 h -1 Z M 18 7 h 1 v 1 h -1 Z M 18 8 h 1 v 1 h -1 Z M 18 9 h 1 v 1 h -1 Z M 18 10 h 1 v 1 h -1 Z M 18 11 h 1 v 1 h -1 Z M 18 12 h 1 v 1 h -1 Z M 18 17 h 1 v 1 h -1 Z M 19 17 h 1 v 1 h -1 Z" class="ColorScheme-Text"/>
+  </g>
+</svg>
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#4d4d4d;
+      }
+      </style>
+  </defs>
+  <g transform="translate(1,1)">
+  <path style="fill:currentColor;fill-opacity:1;stroke:none" d="M 3 5 h 1 v 1 h -1 Z M 3 6 h 1 v 1 h -1 Z M 3 7 h 1 v 1 h -1 Z M 3 8 h 1 v 1 h -1 Z M 3 9 h 1 v 1 h -1 Z M 3 10 h 1 v 1 h -1 Z M 3 11 h 1 v 1 h -1 Z M 3 12 h 1 v 1 h -1 Z M 3 13 h 1 v 1 h -1 Z M 3 14 h 1 v 1 h -1 Z M 3 15 h 1 v 1 h -1 Z M 3 16 h 1 v 1 h -1 Z M 4 5 h 1 v 1 h -1 Z M 4 13 h 1 v 1 h -1 Z M 4 16 h 1 v 1 h -1 Z M 5 5 h 1 v 1 h -1 Z M 5 13 h 1 v 1 h -1 Z M 5 16 h 1 v 1 h -1 Z M 6 5 h 1 v 1 h -1 Z M 6 13 h 1 v 1 h -1 Z M 6 16 h 1 v 1 h -1 Z M 7 5 h 1 v 1 h -1 Z M 7 13 h 1 v 1 h -1 Z M 7 16 h 1 v 1 h -1 Z M 8 5 h 1 v 1 h -1 Z M 8 13 h 1 v 1 h -1 Z M 8 16 h 1 v 1 h -1 Z M 9 5 h 1 v 1 h -1 Z M 9 13 h 1 v 1 h -1 Z M 9 16 h 1 v 1 h -1 Z M 10 5 h 1 v 1 h -1 Z M 10 13 h 1 v 1 h -1 Z M 10 16 h 1 v 1 h -1 Z M 11 5 h 1 v 1 h -1 Z M 11 13 h 1 v 1 h -1 Z M 11 14 h 1 v 1 h -1 Z M 11 15 h 1 v 1 h -1 Z M 11 16 h 1 v 1 h -1 Z M 12 5 h 1 v 1 h -1 Z M 12 13 h 1 v 1 h -1 Z M 12 16 h 1 v 1 h -1 Z M 13 5 h 1 v 1 h -1 Z M 14 5 h 1 v 1 h -1 Z M 14 17 h 1 v 1 h -1 Z M 15 5 h 1 v 1 h -1 Z M 15 17 h 1 v 1 h -1 Z M 16 5 h 1 v 1 h -1 Z M 16 17 h 1 v 1 h -1 Z M 17 5 h 1 v 1 h -1 Z M 17 14 h 1 v 1 h -1 Z M 17 15 h 1 v 1 h -1 Z M 17 16 h 1 v 1 h -1 Z M 17 17 h 1 v 1 h -1 Z M 17 18 h 1 v 1 h -1 Z M 17 19 h 1 v 1 h -1 Z M 18 5 h 1 v 1 h -1 Z M 18 6 h 1 v 1 h -1 Z M 18 7 h 1 v 1 h -1 Z M 18 8 h 1 v 1 h -1 Z M 18 9 h 1 v 1 h -1 Z M 18 10 h 1 v 1 h -1 Z M 18 11 h 1 v 1 h -1 Z M 18 12 h 1 v 1 h -1 Z M 18 17 h 1 v 1 h -1 Z M 19 17 h 1 v 1 h -1 Z" class="ColorScheme-Text"/>
+  </g>
+</svg>
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#4d4d4d;
+      }
+      </style>
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+  <g transform="translate(1,1)">
+  <path style="fill:#dcdcdc;fill-opacity:1;stroke:none" d="M 3 3 h 16 v 1 h -16 Z M 3 4 h 1 v 15 h -1 Z M 4 18 h 10 v 1 h -10 Z M 18 4 h 1 v 8 h -1 Z M 16 14 h 1 v 5 h -1 Z M 14 16 h 5 v 1 h -5 Z" class="ColorScheme-Text"/>
+  <path style="fill:#dcdcdc;fill-opacity:1;stroke:none" d="M 5 7 h 1 v 1 h -1 Z M 6 7 h 1 v 1 h -1 Z M 7 7 h 1 v 1 h -1 Z M 5 8 h 1 v 1 h -1 Z M 7 8 h 1 v 1 h -1 Z M 5 9 h 1 v 1 h -1 Z M 6 9 h 1 v 1 h -1 Z M 7 9 h 1 v 1 h -1 Z M 5 10 h 1 v 1 h -1 Z M 5 11 h 1 v 1 h -1 Z M 9 7 h 1 v 1 h -1 Z M 10 7 h 1 v 1 h -1 Z M 9 8 h 1 v 1 h -1 Z M 11 8 h 1 v 1 h -1 Z M 9 9 h 1 v 1 h -1 Z M 11 9 h 1 v 1 h -1 Z M 9 10 h 1 v 1 h -1 Z M 11 10 h 1 v 1 h -1 Z M 9 11 h 1 v 1 h -1 Z M 10 11 h 1 v 1 h -1 Z M 13 7 h 1 v 1 h -1 Z M 14 7 h 1 v 1 h -1 Z M 15 7 h 1 v 1 h -1 Z M 13 8 h 1 v 1 h -1 Z M 13 9 h 1 v 1 h -1 Z M 14 9 h 1 v 1 h -1 Z M 13 10 h 1 v 1 h -1 Z M 13 11 h 1 v 1 h -1 Z" class="ColorScheme-Text"/>
+  </g>
+</svg>
@@ -38,6 +38,13 @@ An icon counts as line art when fewer than 20% of its visible pixels are
 saturated. Its dark copy keeps hue and alpha and inverts lightness, scaled
 so pure black becomes (220, 220, 220), the dark palette's text color.

+An icon drawn as a light object is left alone even when it is not
+saturated: a page sheet, a printer body, the white half of the background
+swatch. Such art already reads on a dark toolbar, and inverting it would
+turn the white body black (the PDF import icon, GitHub #919). The test is
+the share of visible pixels that are near white: 30% or more and the icon
+inherits from the light theme untouched.
+
 Requires Pillow. Idempotent: running it twice changes nothing.
 """

@@ -64,16 +71,21 @@ SIZES = ["16x16", "22x22", "32x32", "48x48", "128x128"]

 # Table entries in sources/qeticons.cpp that pair a 16 pixel file with a
 # 22 pixel file of another name. The theme needs one name per icon, so
-# the 22 pixel file is exposed under the 16 pixel name as well.
+# the 22 pixel file is exposed under the 16 pixel name as well. The folio
+# icons that used to be listed here are SVGs now (ico/scalable/).
 ALIASES = {
    "22x22/conductor2.png": "conductor-reset",
-    "22x22/diagram_add.png": "folio-new",
-    "22x22/diagram_del.png": "folio-delete",
-    "22x22/dialog-information.png": "folio-properties",
 }

-# SVG icons referenced from sources/qeticons.cpp.
+# SVG icons referenced from sources/qeticons.cpp. ico/scalable/ holds the
+# ones drawn for QET as vectors; one file serves every size.
 SVGS = [
+    "scalable/diagram.svg",
+    "scalable/folio-delete.svg",
+    "scalable/folio-new.svg",
+    "scalable/folio-properties.svg",
+    "scalable/label.svg",
+    "scalable/pdf-import.svg",
    "breeze-icons/scalable/apps/hidef/edit-opacity.svg",
    "breeze-icons/scalable/apps/hidef/image-flip-horizontal-symbolic.svg",
    "breeze-icons/scalable/apps/hidef/image-flip-vertical-symbolic.svg",
@@ -85,6 +97,8 @@ SVGS = [
 ]

 SATURATED_FRACTION = 0.20   # at or above this an icon is "colored"
+WHITE_LIGHTNESS = 0.85      # a visible pixel this light counts as white
+WHITE_FRACTION = 0.30       # at or above this an icon is "light art"
 INK = 220 / 255.0           # lightness of pure black after inversion
 SVG_INK = "#dcdcdc"

@@ -107,6 +121,16 @@ def is_line_art(image):
    return saturated / len(pixels) < SATURATED_FRACTION


+def has_light_fill(image):
+    """True when the icon is mostly white: a page, a sheet, a light body."""
+    pixels = visible_pixels(image)
+    if not pixels:
+        return False
+    white = sum(1 for r, g, b, _ in pixels
+                if colorsys.rgb_to_hls(r / 255, g / 255, b / 255)[1] > WHITE_LIGHTNESS)
+    return white / len(pixels) >= WHITE_FRACTION
+
+
 def invert_lightness(image):
    """Invert lightness, keeping hue, saturation and alpha.

@@ -177,7 +201,7 @@ def main():
    light = []   # (alias, source) pairs, paths relative to ico/
    dark = []    # paths relative to ico/, files exist on disk
    changed = 0
-    line_art = colored = 0
+    line_art = colored = light_art = 0

    for size in SIZES:
        folder = ICO / size
@@ -188,7 +212,10 @@ def main():
                names.append(ALIASES[rel])
            image = Image.open(png).convert("RGBA")
            art = is_line_art(image)
-            if art:
+            if art and has_light_fill(image):
+                art = False
+                light_art += 1
+            elif art:
                line_art += 1
                dark_image = None
            else:
@@ -213,6 +240,15 @@ def main():
        changed += write_if_changed(target, text)
        dark.append(f"themes/qet-dark/scalable/{name}")

+    # Drop dark files from an earlier run that are no longer generated, so
+    # a reclassified icon falls back to the light theme instead of keeping
+    # a stale copy.
+    for stale in sorted((THEMES / "qet-dark").glob("*/*")):
+        if stale.is_file() and stale.name != "index.theme" \
+                and str(stale.relative_to(ICO)) not in dark:
+            stale.unlink()
+            changed += 1
+
    dirs = SIZES + ["scalable"]
    changed += write_if_changed(THEMES / "qet" / "index.theme",
                                index_theme("qet", "QElectroTech icons", dirs))
@@ -231,8 +267,8 @@ def main():
    qrc += ["    </qresource>", "</RCC>", ""]
    changed += write_if_changed(QRC, "\n".join(qrc))

-    print(f"{line_art} line-art icons, {colored} colored icons, {len(SVGS)} SVGs; "
-          f"{changed} files written")
+    print(f"{line_art} line-art icons, {light_art} light icons, {colored} colored icons, "
+          f"{len(SVGS)} SVGs; {changed} files written or removed")


 if __name__ == "__main__":
@@ -93,10 +93,7 @@
        <file>ico/22x22/conductor2.png</file>
        <file>ico/22x22/configure.png</file>
        <file>ico/22x22/configure-toolbars.png</file>
-        <file>ico/22x22/diagram_add.png</file>
-        <file>ico/22x22/diagram_del.png</file>
        <file>ico/22x22/dialog-cancel.png</file>
-        <file>ico/22x22/dialog-information.png</file>
        <file>ico/22x22/dialog-ok.png</file>
        <file>ico/22x22/document-close.png</file>
        <file>ico/22x22/document-export.png</file>
@@ -140,8 +137,6 @@
        <file>ico/22x22/go-up.png</file>
        <file>ico/22x22/hotspot.png</file>
        <file>ico/22x22/insert-image.png</file>
-        <file>ico/22x22/pdf-import.png</file>
-        <file>ico/22x22/label.png</file>
        <file>ico/22x22/landscape.png</file>
        <file>ico/22x22/line.png</file>
        <file>ico/22x22/list-add.png</file>
@@ -242,7 +237,6 @@
        <file>ico/16x16/project.png</file>
        <file>ico/16x16/qt.png</file>
        <file>ico/16x16/terminalstrip.png</file>
-        <file>ico/22x22/diagram.png</file>
        <file>ico/22x22/edit-clear-locationbar-rtl.png</file>
        <file>ico/22x22/export-csv.png</file>
        <file>ico/22x22/format-text-subscript.png</file>
@@ -0,0 +1,54 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "elementpreviewdelegate.h"
+
+#include <QWidget>
+
+#include "../qetpalette.h"
+
+/**
+	@brief ElementPreviewDelegate::initStyleOption
+	After the base class has filled the option from the model, replace
+	the icon with one that reads on a dark palette. The adapted icon is
+	built from the pixmap the view is about to draw, at the view's
+	decoration size and device pixel ratio.
+*/
+void ElementPreviewDelegate::initStyleOption(QStyleOptionViewItem *option,
+                                             const QModelIndex &index) const
+{
+	QStyledItemDelegate::initStyleOption(option, index);
+	if (option->icon.isNull() || !QET::Palette::isDark(option->palette))
+		return;
+
+	const qint64 key = option->icon.cacheKey();
+	const auto it = m_dark_icons.constFind(key);
+	if (it != m_dark_icons.constEnd())
+	{
+		option->icon = *it;
+		return;
+	}
+
+	const qreal dpr = option->widget ? option->widget->devicePixelRatio() : 1.0;
+	const QPixmap source = option->icon.pixmap(option->decorationSize, dpr);
+	const QPixmap adapted = QET::Palette::forPalette(source, option->palette);
+	QIcon icon = option->icon;
+	if (adapted.cacheKey() != source.cacheKey())
+		icon = QIcon(adapted);
+	m_dark_icons.insert(key, icon);
+	option->icon = icon;
+}
@@ -0,0 +1,50 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef ELEMENTPREVIEWDELEGATE_H
+#define ELEMENTPREVIEWDELEGATE_H
+
+#include <QHash>
+#include <QIcon>
+#include <QStyledItemDelegate>
+
+/**
+	@brief The ElementPreviewDelegate class
+	Draws the items of an element collection tree with icons that read on
+	the current palette. Element previews are black line art drawn for a
+	white sheet; on a dark palette this delegate hands the view the same
+	picture with its lightness inverted (QET::Palette::forPalette), so the
+	ink is light on the dark row. Colored icons, such as folders, are left
+	alone, and nothing changes on a light palette. Adapted icons are kept
+	per source icon, so a repaint costs a hash lookup.
+*/
+class ElementPreviewDelegate : public QStyledItemDelegate
+{
+	Q_OBJECT
+
+	public:
+		using QStyledItemDelegate::QStyledItemDelegate;
+
+	protected:
+		void initStyleOption(QStyleOptionViewItem *option,
+		                     const QModelIndex &index) const override;
+
+	private:
+		mutable QHash<qint64, QIcon> m_dark_icons;
+};
+
+#endif
@@ -725,7 +725,10 @@ void ElementsCollectionWidget::showThisDir()
 		ElementCollectionItem *eci =
 				elementCollectionItemForIndex(m_showed_index);
 		if (eci)
+		{
 			eci->setBackground(QBrush());
+			eci->setForeground(QBrush());
+		}
 	}

 	m_showed_index = m_index_at_context_menu;
@@ -736,7 +739,11 @@ void ElementsCollectionWidget::showThisDir()
 		ElementCollectionItem *eci =
 				elementCollectionItemForIndex(m_showed_index);
 		if (eci)
+		{
+			// Amber under black, whatever the palette's text color.
 			eci->setBackground(QBrush(QColor(255, 204, 0, 255)));
+			eci->setForeground(QBrush(Qt::black));
+		}
 		search();
 	}
 	else
@@ -755,7 +762,10 @@ void ElementsCollectionWidget::resetShowThisDir()
 		ElementCollectionItem *eci = elementCollectionItemForIndex(
 					m_showed_index);
 		if (eci)
+		{
 			eci->setBackground(QBrush());
+			eci->setForeground(QBrush());
+		}
 	}

 	m_showed_index = QModelIndex();
@@ -16,6 +16,8 @@
 	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include "elementstreeview.h"
+#include "elementpreviewdelegate.h"
+#include "../qetpalette.h"

 #include "../factory/elementfactory.h"
 #include "../qetgraphicsitem/element.h"
@@ -41,24 +43,11 @@ static int MAX_DND_PIXMAP_HEIGHT = 375;
 ElementsTreeView::ElementsTreeView(QWidget *parent) :
 	QTreeView(parent)
 {
-	// force du noir sur une alternance de blanc (comme le schema) et de gris
-	// clair, avec du blanc sur bleu pas trop fonce pour la selection
-	//
-	// Element icons are rendered with colors read directly from each .elmt
-	// file (almost always black linework, matching printed-schematic
-	// convention) onto a transparent background -- so this view must keep
-	// a light background regardless of the OS/desktop theme, or the icons
-	// become invisible on dark themes. QAbstractItemView paints its rows
-	// using the viewport's palette, not the view's own, so the palette
-	// must be applied to both to actually take effect under every style.
-	QPalette qp = palette();
-	qp.setColor(QPalette::Text,            Qt::black);
-	qp.setColor(QPalette::Base,            Qt::white);
-	qp.setColor(QPalette::AlternateBase,   QColor("#e8e8e8"));
-	qp.setColor(QPalette::Highlight,       QColor("#678db2"));
-	qp.setColor(QPalette::HighlightedText, Qt::black);
-	setPalette(qp);
-	viewport()->setPalette(qp);
+	// Rows follow the application palette. Element previews are black
+	// line art drawn for a white sheet; ElementPreviewDelegate adapts them
+	// to a dark palette, so this view no longer has to force a light one
+	// (bugtracker #335).
+	setItemDelegate(new ElementPreviewDelegate(this));
 }

 /**
@@ -220,7 +209,7 @@ void ElementsTreeView::startElementDrag(const ElementsLocation &location)
 			&elmt_creation_state));
 		if (elmt_creation_state) { return; }

-		QPixmap elmt_pixmap(temp_elmt->pixmap());
+		QPixmap elmt_pixmap(QET::Palette::forPalette(temp_elmt->pixmap(), palette()));
 		QPoint elmt_hotspot(temp_elmt->hotspot());

 			//Adjust the size of the pixmap if he is too big
@@ -26,6 +26,7 @@
 #include "diagramposition.h"
 #include "factory/elementfactory.h"
 #include "qetapp.h"
+#include "qetpalette.h"
 #include "qetgraphicsitem/ViewItem/qetgraphicstableitem.h"
 #include "qetgraphicsitem/conductor.h"
 #include "qetgraphicsitem/conductortextitem.h"
@@ -283,10 +284,11 @@ void Diagram::drawBackground(QPainter *p, const QRectF &r) {
 			 * if background color is black,
 			 * then grid spots shall be white,
 			 * else they shall be black in color.
+			 * A view that shows the sheet with its lightness inverted
+			 * gets softer dots, see QET::Palette::gridDotColor.
 			 */
 		QPen pen;
-		Diagram::background_color == Qt::black? pen.setColor(Qt::white)
-							  : pen.setColor(Qt::black);
+		pen.setColor(QET::Palette::gridDotColor(Diagram::background_color, m_inverted_lightness));
 		pen.setCosmetic(true);
 		p->setPen(pen);

@@ -123,6 +123,7 @@ class Diagram : public QGraphicsScene
 		qreal diagram_qet_version_;

 		bool draw_grid_;
+		bool m_inverted_lightness = false;
 		bool use_border_;
 		bool draw_guides_;
 		QList<Diagram::Guide> m_guides_list;
@@ -222,6 +223,7 @@ class Diagram : public QGraphicsScene
 		ExportProperties applyProperties(const ExportProperties &);
 		void setDisplayGrid(bool);
 		bool displayGrid();
+		void setInvertedLightness(bool);
 		void setDisplayGuides(bool);
 		bool displayGuides();
 		void updateProjectGuides(const QList<GuideProperties> &guides);
@@ -355,6 +357,18 @@ inline void Diagram::setDisplayGrid(bool dg) {
 	draw_grid_ = dg;
 }

+/**
+	@brief Diagram::setInvertedLightness
+	Tell the diagram whether the view painting it will show the result
+	with its lightness inverted (PaletteGraphicsView on a dark palette).
+	drawBackground draws a softer grid in that case. Printing
+	and export never set this.
+	@param inverted
+*/
+inline void Diagram::setInvertedLightness(bool inverted) {
+	m_inverted_lightness = inverted;
+}
+
 /**
 	@brief Diagram::displayGrid
 	@return draw_grid_ true if the grid is drawn, false otherwise.
@@ -29,7 +29,14 @@
 */
 DiagramEventAddText::DiagramEventAddText(Diagram *diagram) :
 	DiagramEventInterface(diagram)
-{}
+{
+		//The tool is armed from the moment it is attached: the next left
+		//click places a text. DiagramView::keyPressEvent() asks
+		//Diagram::eventInterfaceIsRunning() -- which is isRunning(), i.e.
+		//m_running -- before letting Escape through to the tool, so without
+		//this the view swallows Escape and the tool cannot be cancelled.
+	m_running = true;
+}

 /**
 	@brief DiagramEventAddText::~DiagramEventAddText
@@ -52,6 +59,8 @@ void DiagramEventAddText::mousePressEvent(QGraphicsSceneMouseEvent *event)
 										event->scenePos()));
 		text->setTextInteractionFlags(Qt::TextEditorInteraction);
 		text->setFocus(Qt::MouseFocusReason);
+			//Placed: the tool is done before it announces it.
+		m_running = false;
 		emit finish();
 		event->setAccepted(true);
 	}
@@ -39,7 +39,9 @@
 #include "ElementsCollection/xmlelementcollection.h"
 #include "NameList/nameslist.h"
 #include "elementdialog.h"
+#include <QApplication>
 #include <QDropEvent>
+#include <QPainter>
 #include <QPointer>

 /**
@@ -48,7 +50,7 @@
 	@param parent Le QWidget parent de cette vue de schema
 */
 DiagramView::DiagramView(Diagram *diagram, QWidget *parent) :
-	QGraphicsView (parent),
+	PaletteGraphicsView (parent),
 	m_diagram (diagram)
 {
 	grabGesture(Qt::PinchGesture);
@@ -1081,6 +1083,16 @@ bool DiagramView::event(QEvent *e) {
 	return(QGraphicsView::event(e));
 }

+/**
+	@brief DiagramView::paintingInverted
+	Reimplemented from PaletteGraphicsView: tell the diagram it is being
+	drawn for an inverted display, so it softens its grid.
+*/
+void DiagramView::paintingInverted(bool inverted)
+{
+	m_diagram->setInvertedLightness(inverted);
+}
+
 /**
 	@brief DiagramView::paintEvent
 	Reimplemented from QGraphicsView
@@ -1088,7 +1100,7 @@ bool DiagramView::event(QEvent *e) {
 */
 void DiagramView::paintEvent(QPaintEvent *event)
 {
-	QGraphicsView::paintEvent(event);
+	PaletteGraphicsView::paintEvent(event);

 	if (m_free_rubberbanding && m_free_rubberband.count() >= 3)
 	{
@@ -22,7 +22,7 @@
 #include "titleblock/templatelocation.h"

 #include <QClipboard>
-#include <QGraphicsView>
+#include "palettegraphicsview.h"

 class Conductor;
 class Diagram;
@@ -35,7 +35,7 @@ class QGestureEvent;
 	This class provides a widget to render an electric diagram in an editable,
 	interactive way.
 */
-class DiagramView : public QGraphicsView
+class DiagramView : public PaletteGraphicsView
 {
 	Q_OBJECT
 	
@@ -84,6 +84,7 @@ class DiagramView : public QGraphicsView
 		///Set for one call only, by the Escape handler, to let focus leave the view.
 		bool m_releasing_focus = false;
 		void paintEvent(QPaintEvent *event) override;
+		void paintingInverted(bool inverted) override;
 		void mousePressEvent(QMouseEvent *) override;
 		void mouseMoveEvent(QMouseEvent *) override;
 		void mouseReleaseEvent(QMouseEvent *) override;
@@ -52,6 +52,18 @@ ElementsCollectionCache::ElementsCollectionCache(const QString &database_path, Q
 		QSqlQuery(cache_db_).exec("PRAGMA locking_mode = EXCLUSIVE");
 		QSqlQuery(cache_db_).exec("PRAGMA synchronous = OFF");

+			// Previews used to be stored on an opaque white sheet; they are
+			// transparent now, so the collection tree can adapt them to a
+			// dark palette. A cache written before that is dropped once.
+		QSqlQuery(cache_db_).exec("CREATE TABLE IF NOT EXISTS meta"
+					   "(key VARCHAR(32) NOT NULL PRIMARY KEY, value VARCHAR(64));");
+		QSqlQuery meta(cache_db_);
+		meta.exec("SELECT value FROM meta WHERE key = 'pixmaps'");
+		if (!meta.next() || meta.value(0).toString() != QLatin1String("transparent")) {
+			QSqlQuery(cache_db_).exec("DROP TABLE IF EXISTS pixmaps");
+			QSqlQuery(cache_db_).exec("DROP TABLE IF EXISTS names");
+			QSqlQuery(cache_db_).exec("REPLACE INTO meta (key, value) VALUES ('pixmaps', 'transparent')");
+		}
 #if TODO_LIST
 #pragma message("@TODO the tables could already exist, handle that case.")
 #endif
@@ -54,24 +54,8 @@ ElementsPanel::ElementsPanel(QWidget *parent) :
 	setDropIndicatorShown(true);
 	setAutoExpandDelay(1000);
 	
-	// force du noir sur une alternance de blanc (comme le schema) et de gris
-	// clair, avec du blanc sur bleu pas trop fonce pour la selection
-	//
-	// Element icons are rendered with colors read directly from each .elmt
-	// file (almost always black linework, matching printed-schematic
-	// convention) onto a transparent background -- so this view must keep
-	// a light background regardless of the OS/desktop theme, or the icons
-	// become invisible on dark themes. QAbstractItemView paints its rows
-	// using the viewport's palette, not the view's own, so the palette
-	// must be applied to both to actually take effect under every style.
-	QPalette qp = palette();
-	qp.setColor(QPalette::Text,            Qt::black);
-	qp.setColor(QPalette::Base,            Qt::white);
-	qp.setColor(QPalette::AlternateBase,   QColor("#e8e8e8"));
-	qp.setColor(QPalette::Highlight,       QColor("#678db2"));
-	qp.setColor(QPalette::HighlightedText, Qt::black);
-	setPalette(qp);
-	viewport()->setPalette(qp);
+	// Rows follow the application palette; the icons shown here come from
+	// the icon theme, which has a dark variant.
 	
 		// we handle double click on items ourselves
 	connect(this, &ElementsPanel::itemDoubleClicked, this, &ElementsPanel::slot_doubleClick);
@@ -146,12 +146,13 @@ QPixmap ElementPictureFactory::pixmap(const ElementsLocation &location)
 		QPixmap pix(w, h);
 			//Element definitions almost always draw with a hardcoded black
 			//stroke color, on the assumption of the white diagram sheet they
-			//are normally placed on. A transparent background here makes
-			//that stroke disappear against a dark widget/tree-view background
-			//(bugtracker #335). Give it an opaque white background instead -
-			//exactly what the element already assumes visually, in every
-			//context this pixmap is used (tree icons, drag icon, previews).
-		pix.fill(Qt::white);
+			//are normally placed on. The pixmap is kept as drawn, on a
+			//transparent background: the places that show it (the
+			//collection tree through ElementPreviewDelegate, the drag icon)
+			//adapt it to the palette with QET::Palette::forPalette(), so a
+			//dark palette gets light ink instead of black on black
+			//(bugtracker #335).
+		pix.fill(Qt::transparent);

 		QPainter painter(&pix);
 		painter.setRenderHint(QPainter::Antialiasing, true);
@@ -0,0 +1,184 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "palettegraphicsview.h"
+
+#include "qetpalette.h"
+
+#include <QApplication>
+#include <QEvent>
+#include <QPainter>
+#include <QPaintEvent>
+#include <QStyleHintReturnMask>
+#include <QStyleOptionRubberBand>
+#include <QtMath>
+
+PaletteGraphicsView::PaletteGraphicsView(QWidget *parent) :
+	QGraphicsView(parent)
+{
+	qApp->installEventFilter(this);
+	setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
+}
+
+PaletteGraphicsView::PaletteGraphicsView(QGraphicsScene *scene, QWidget *parent) :
+	QGraphicsView(scene, parent)
+{
+	qApp->installEventFilter(this);
+	setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
+	listenToScene(scene);
+}
+
+/**
+	@brief PaletteGraphicsView::setScene
+	Same as QGraphicsView::setScene, and keeps the scene's updates flowing
+	(see the class description).
+*/
+void PaletteGraphicsView::setScene(QGraphicsScene *scene)
+{
+	QGraphicsView::setScene(scene);
+	listenToScene(scene);
+}
+
+/**
+	@brief PaletteGraphicsView::invertsLightness
+	@return true when the scene is shown with its lightness inverted,
+	i.e. when the application palette is dark. The application palette,
+	not the view's own: a style sheet on an ancestor (the folio tab
+	widget has one) makes QStyleSheetStyle pin the palette of every
+	widget under it to the application palette in force when the sheet
+	was applied, so after a live light/dark switch palette() is stale.
+*/
+bool PaletteGraphicsView::invertsLightness() const
+{
+	return QET::Palette::isDark(QApplication::palette());
+}
+
+void PaletteGraphicsView::paintingInverted(bool inverted)
+{
+	Q_UNUSED(inverted)
+}
+
+/**
+	@brief PaletteGraphicsView::listenToScene
+	Connect a receiver to the scene's changed() signal, dropping the one
+	on the previous scene. Any receiver does; this one has nothing to do.
+	The connection dies with the view.
+*/
+void PaletteGraphicsView::listenToScene(QGraphicsScene *scene)
+{
+	disconnect(m_scene_connection);
+	m_scene_connection = QMetaObject::Connection();
+	if (scene)
+		m_scene_connection = connect(scene, &QGraphicsScene::changed,
+		                             this, [](const QList<QRectF> &) {});
+}
+
+/**
+	@brief PaletteGraphicsView::eventFilter
+	Repaint the whole viewport when the application palette changes. Qt
+	sends that change to the application object and then repaints only
+	the widgets whose own palette changed with it, which under a style
+	sheet is not the case (see invertsLightness()): the scene would then
+	repaint only what it updates itself, and the viewport around the
+	sheet would keep the colors of the previous palette. The filter sits
+	on the application object, the one receiver Qt always notifies.
+*/
+bool PaletteGraphicsView::eventFilter(QObject *watched, QEvent *event)
+{
+	if (watched == qApp && event->type() == QEvent::ApplicationPaletteChange)
+		viewport()->update();
+	return QGraphicsView::eventFilter(watched, event);
+}
+
+/**
+	@brief PaletteGraphicsView::paintEvent
+	Paints as QGraphicsView on a light palette, inverted on a dark one.
+*/
+void PaletteGraphicsView::paintEvent(QPaintEvent *event)
+{
+	if (invertsLightness())
+		paintInverted(event->rect());
+	else
+		QGraphicsView::paintEvent(event);
+}
+
+/**
+	@brief PaletteGraphicsView::paintInverted
+	Render \a area of the viewport into an off-screen image, invert the
+	lightness of that image between the palette's Base and Text colors and
+	blit it to the viewport. Inverting the finished rendering turns the
+	white sheet dark and the black ink light in one pass, and keeps the
+	hue of colored strokes.
+	@param area the part of the viewport to repaint, in viewport coordinates
+*/
+void PaletteGraphicsView::paintInverted(const QRect &area)
+{
+	const QRect rect = area.intersected(viewport()->rect());
+	if (rect.isEmpty())
+		return;
+
+	const qreal ratio = viewport()->devicePixelRatioF();
+	QImage buffer(qCeil(rect.width() * ratio), qCeil(rect.height() * ratio),
+	              QImage::Format_RGB32);
+	buffer.setDevicePixelRatio(ratio);
+	// render() paints only what the scene draws; what it leaves blank is
+	// the white sheet, which the inversion turns into the Base color.
+	buffer.fill(Qt::white);
+
+	QPainter buffer_painter(&buffer);
+	buffer_painter.setRenderHints(renderHints());
+	paintingInverted(true);
+	render(&buffer_painter, QRectF(QPointF(0, 0), QSizeF(rect.size())),
+	       rect, Qt::IgnoreAspectRatio);
+	paintingInverted(false);
+	buffer_painter.end();
+
+	// The application palette, for the reason given in invertsLightness().
+	const QPalette application_palette = QApplication::palette();
+	QET::Palette::invertLightness(buffer, application_palette.color(QPalette::Base),
+	                              application_palette.color(QPalette::Text));
+
+	QPainter painter(viewport());
+	painter.drawImage(rect.topLeft(), buffer);
+	drawRubberBand(painter);
+}
+
+/**
+	@brief PaletteGraphicsView::drawRubberBand
+	Draw the selection rubber band the way QGraphicsView::paintEvent does.
+	Rendering the view into an off-screen image skips it, so it is drawn
+	here instead, after the inversion, in the palette colors.
+	@param painter a painter on the viewport
+*/
+void PaletteGraphicsView::drawRubberBand(QPainter &painter)
+{
+	const QRect band = rubberBandRect();
+	if (band.isNull())
+		return;
+
+	QStyleOptionRubberBand option;
+	option.initFrom(viewport());
+	option.rect = band;
+	option.shape = QRubberBand::Rectangle;
+
+	QStyleHintReturnMask mask;
+	if (viewport()->style()->styleHint(QStyle::SH_RubberBand_Mask, &option,
+	                                   viewport(), &mask))
+		painter.setClipRegion(mask.region, Qt::IntersectClip);
+	viewport()->style()->drawControl(QStyle::CE_RubberBand, &option,
+	                                 &painter, viewport());
+}
@@ -0,0 +1,85 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef PALETTE_GRAPHICS_VIEW_H
+#define PALETTE_GRAPHICS_VIEW_H
+
+#include <QGraphicsView>
+
+class QPainter;
+
+/**
+	A QGraphicsView that shows its scene with inverted lightness while its
+	palette is dark: white becomes the palette's Base color, black its Text
+	color, and colored strokes keep their hue. The scene itself is left as
+	drawn, so printing and exporting it still give black on white. On a
+	light palette the view paints exactly as QGraphicsView does.
+
+	The view paints through QGraphicsView::render() into an image and blits
+	the inverted image. QGraphicsView delivers scene updates straight to
+	its viewport when nobody listens to QGraphicsScene::changed(), and in
+	that mode the scene clears its "update everything" flag only when the
+	items are painted straight onto the viewport, which never happens
+	here: from the second QGraphicsScene::update() on, every scene update
+	and every item update would wait for an unrelated repaint. So the view
+	listens to changed() on every scene it is given, which makes the scene
+	clear the flag before it emits. Set the scene through this class, not
+	through a QGraphicsView pointer.
+
+	The constructor also forces QGraphicsView::FullViewportUpdate in place
+	of the default MinimalViewportUpdate. #954 shipped with the default
+	kept, and moving an item then left conductor-shaped ghosts behind on
+	both a light and a dark palette, so the cause is shared code, not
+	paintInverted(): most likely listening to changed() at all, above,
+	changes which of QGraphicsScene's two update paths a view is on, and
+	MinimalViewportUpdate's job of turning the scene's reported dirty
+	rects into the smallest correct viewport region is where that would
+	show up first. FullViewportUpdate removes the need to get that region
+	right by repainting the whole viewport on every update; the class's
+	own benchmark already shows that cost is small next to a frame budget.
+*/
+class PaletteGraphicsView : public QGraphicsView
+{
+	Q_OBJECT
+
+	public:
+		explicit PaletteGraphicsView(QWidget *parent = nullptr);
+		explicit PaletteGraphicsView(QGraphicsScene *scene, QWidget *parent = nullptr);
+
+		void setScene(QGraphicsScene *scene);
+		bool invertsLightness() const;
+
+	protected:
+		bool eventFilter(QObject *watched, QEvent *event) override;
+		void paintEvent(QPaintEvent *event) override;
+		/**
+			Called with true right before the scene is rendered for an
+			inverted display and with false right after, so a scene can
+			adapt what it draws (a softer grid, for instance). Does
+			nothing by default.
+		*/
+		virtual void paintingInverted(bool inverted);
+
+	private:
+		void listenToScene(QGraphicsScene *scene);
+		void paintInverted(const QRect &area);
+		void drawRubberBand(QPainter &painter);
+
+		QMetaObject::Connection m_scene_connection;
+};
+
+#endif
@@ -28,6 +28,7 @@
 #include "qetdiagrameditor.h"
 #include "qeticons.h"
 #include "qetpalette.h"
+#include "qetstyle.h"
 #include "utils/qetutils.h"
 #include "qetmessagebox.h"
 #include "qetproject.h"
@@ -52,6 +53,7 @@
 #include <QFontDatabase>
 #include <QProcessEnvironment>
 #include <QRegularExpression>
+#include <QStyleFactory>
 #include <QStyleHints>
 #ifdef BUILD_WITHOUT_KF
 #	include "ui/nokde/kautosavefile.h"
@@ -2368,6 +2370,12 @@ void QETApp::applyIconTheme(const QPalette &palette)
 */
 void QETApp::initStyle()
 {
+	// Wrap the running style so icons get a hover state (see qetstyle.h).
+	// The proxy keeps the base style's object name, so the Fusion checks
+	// below still see "fusion".
+	if (!qobject_cast<QETStyle *>(qApp->style()))
+		qApp->setStyle(new QETStyle(QStyleFactory::create(qApp->style()->objectName())));
+
 	initial_palette_ = qApp->palette();

 #ifdef Q_OS_MACOS
@@ -50,6 +50,7 @@
 #include "recentfiles.h"
 #include "shortcutmanager.h"
 #include "ui/bomexportdialog.h"
+#include "ui/conductorcolortoolbutton.h"
 #include "ui/jumptoelementdialog.h"
 #include "ui/diagrampropertieseditordockwidget.h"
 #include "ui/backupdialog.h"
@@ -389,6 +390,13 @@ void QETDiagramEditor::setUpActions()
 		if (ProjectView *pv = currentProjectView())
 			pv->project()->setAutoConductor(ac);
 	});
+		//Registered with no default sequence on purpose. This is a
+		//setting some people toggle constantly and others never touch,
+		//so it earns a place in the Shortcuts page rather than a key of
+		//its own taken from the ones still free. Asked for on the forum
+		//(viewtopic.php?pid=23296): "est il possible dans les raccourcis
+		//d'ajouter un pour création automatique de conducteur ?"
+	ShortcutManager::instance().registerAction(m_auto_conductor, "diagrameditor.auto_conductor", tr("Éditeur de schémas"), QKeySequence());

 		//AutoBreakConductor
 	m_auto_break_conductor = new QAction   (QET::Icons::Conductor, tr("Coupure automatique de conducteur(s)","Tool tip of auto break conductor"), this);
@@ -912,6 +920,10 @@ void QETDiagramEditor::setUpToolBar()
 	diagram_tool_bar -> addAction (m_conductor_reset);
 	diagram_tool_bar -> addAction (m_auto_conductor);
 	diagram_tool_bar -> addAction (m_auto_break_conductor);
+		//Sits with the conductor actions it works alongside: it colours
+		//the selected conductors and sets the colour of the next one drawn.
+	m_conductor_color_button = new ConductorColorToolButton(this, this);
+	diagram_tool_bar -> addWidget (m_conductor_color_button);

 	m_add_item_tool_bar = new QToolBar(tr("Ajouter"), this);
 	m_add_item_tool_bar->setObjectName("adding");
@@ -2110,6 +2122,10 @@ void QETDiagramEditor::slot_updateModeActions()
 		m_auto_conductor -> setDisabled(true);
 		m_auto_break_conductor -> setDisabled(true);
 	}
+
+	if (m_conductor_color_button) {
+		m_conductor_color_button->updateEnabledState();
+	}
 }

 /**
@@ -32,6 +32,7 @@ class QMdiSubWindow;
 class QETProject;
 class QETResult;
 class ProjectView;
+class ConductorColorToolButton;
 class CustomElement;
 class Diagram;
 class DiagramView;
@@ -237,6 +238,9 @@ class QETDiagramEditor : public QETMainWindow
 		*m_find = nullptr,
 		*m_jump_to_element = nullptr;	///< Open the "jump to element" quick-open popup

+		///< One-click conductor colour, in the "Schéma" toolbar
+		ConductorColorToolButton *m_conductor_color_button = nullptr;
+
 		QList <QAction *> m_zoom_action_toolBar; ///Only zoom action must displayed in the toolbar

 		void removeDiagramSilent(Diagram *diagram);
@@ -17,7 +17,10 @@
 */
 #include "qetpalette.h"

+#include <QColor>
+#include <QImage>
 #include <QStyle>
+
 #include <cmath>

 namespace {
@@ -74,6 +77,57 @@ bool QET::Palette::isDark(const QPalette &palette)
 	return palette.color(QPalette::Active, QPalette::Window).lightness() < 128;
 }

+void QET::Palette::invertLightness(QImage &image, const QColor &sheet,
+                                   const QColor &ink)
+{
+	if (image.format() != QImage::Format_RGB32)
+		image.convertTo(QImage::Format_RGB32);
+
+	// One table per channel maps the inverted value (0 = was white,
+	// 255 = was black) onto the sheet..ink span.
+	uchar red_of[256], green_of[256], blue_of[256];
+	for (int v = 0; v < 256; ++v) {
+		red_of[v]   = uchar(sheet.red()   + (ink.red()   - sheet.red())   * v / 255);
+		green_of[v] = uchar(sheet.green() + (ink.green() - sheet.green()) * v / 255);
+		blue_of[v]  = uchar(sheet.blue()  + (ink.blue()  - sheet.blue())  * v / 255);
+	}
+
+	/* Inverting the lightness of an HSL color while keeping its hue and
+	   saturation leaves the distance between the highest and the lowest
+	   channel unchanged, so it comes down to one offset per pixel:
+	   c + 255 - max - min. The offset turns the highest channel into
+	   255 - min and the lowest into 255 - max, so no channel can leave
+	   the 0..255 range and no clamping is needed. The loop runs on every
+	   repaint of a folio, hence the plain integer arithmetic. */
+	for (int y = 0; y < image.height(); ++y) {
+		quint32 *line = reinterpret_cast<quint32 *>(image.scanLine(y));
+		for (int x = 0, width = image.width(); x < width; ++x) {
+			const quint32 pixel = line[x];
+			const int red   = (pixel >> 16) & 0xff;
+			const int green = (pixel >> 8) & 0xff;
+			const int blue  = pixel & 0xff;
+			int highest = red > green ? red : green;
+			int lowest  = red < green ? red : green;
+			if (blue > highest) highest = blue;
+			if (blue < lowest)  lowest  = blue;
+			const int offset = 255 - highest - lowest;
+			line[x] = 0xff000000u
+			        | (quint32(red_of[red + offset]) << 16)
+			        | (quint32(green_of[green + offset]) << 8)
+			        | quint32(blue_of[blue + offset]);
+		}
+	}
+}
+
+QColor QET::Palette::gridDotColor(const QColor &sheet, bool inverted)
+{
+	if (sheet == QColor(Qt::black))
+		return Qt::white;
+	if (inverted)
+		return QColor(sheet.red() * 2 / 3, sheet.green() * 2 / 3, sheet.blue() * 2 / 3);
+	return Qt::black;
+}
+
 double QET::Palette::contrastRatio(const QColor &a, const QColor &b)
 {
 	double lighter = relativeLuminance(a);
@@ -177,3 +231,68 @@ QPalette QET::Palette::forFusion(const QPalette &platform)
 	return withPlatformAccent(isDark(platform) ? fusionDark() : fusionLight(),
 	                          platform);
 }
+
+bool QET::Palette::isLineArt(const QImage &image)
+{
+	const QImage source = image.convertToFormat(QImage::Format_ARGB32);
+	int visible = 0;
+	int saturated = 0;
+	for (int y = 0; y < source.height(); ++y)
+	{
+		const QRgb *line = reinterpret_cast<const QRgb *>(source.constScanLine(y));
+		for (int x = 0; x < source.width(); ++x)
+		{
+			if (qAlpha(line[x]) <= 64)
+				continue;
+			++visible;
+			const QColor color(line[x]);
+			if (color.hslSaturationF() > 0.25 && color.value() > 60)
+				++saturated;
+		}
+	}
+	return visible > 0 && saturated < visible * 0.20;
+}
+
+QImage QET::Palette::invertedLightness(const QImage &image)
+{
+	// Lightness of pure black after inversion: the dark palette's text.
+	const qreal ink = 220.0 / 255.0;
+	QImage result = image.convertToFormat(QImage::Format_ARGB32);
+	qreal darkest = 1.0;
+	for (int y = 0; y < result.height(); ++y)
+	{
+		const QRgb *line = reinterpret_cast<const QRgb *>(result.constScanLine(y));
+		for (int x = 0; x < result.width(); ++x)
+			if (qAlpha(line[x]) > 64)
+				darkest = qMin(darkest, QColor(line[x]).lightnessF());
+	}
+	const qreal span = qMax(1.0 - darkest, 1e-6);
+	for (int y = 0; y < result.height(); ++y)
+	{
+		QRgb *line = reinterpret_cast<QRgb *>(result.scanLine(y));
+		for (int x = 0; x < result.width(); ++x)
+		{
+			const int alpha = qAlpha(line[x]);
+			if (alpha == 0)
+				continue;
+			const QColor color(line[x]);
+			const qreal lightness = qBound(0.0, ink * (1.0 - (color.lightnessF() - darkest) / span), 1.0);
+			QColor out = QColor::fromHslF(qMax(color.hslHueF(), 0.0), color.hslSaturationF(), lightness);
+			out.setAlpha(alpha);
+			line[x] = out.rgba();
+		}
+	}
+	return result;
+}
+
+QPixmap QET::Palette::forPalette(const QPixmap &pixmap, const QPalette &palette)
+{
+	if (pixmap.isNull() || !isDark(palette))
+		return pixmap;
+	const QImage image = pixmap.toImage();
+	if (!isLineArt(image))
+		return pixmap;
+	QPixmap result = QPixmap::fromImage(invertedLightness(image));
+	result.setDevicePixelRatio(pixmap.devicePixelRatio());
+	return result;
+}
@@ -18,8 +18,11 @@
 #ifndef QET_PALETTE_H
 #define QET_PALETTE_H

+#include <QImage>
 #include <QPalette>
+#include <QPixmap>

+class QImage;
 class QStyle;

 /**
@@ -52,6 +55,28 @@ namespace QET {
 		*/
 		bool isDark(const QPalette &palette);

+		/**
+			Invert the lightness of every pixel of \a image, keeping its hue
+			and saturation, then stretch the result between two colors: pure
+			white becomes \a sheet, pure black becomes \a ink, and a red
+			line stays red, only lighter. Made for a rendering of a white
+			sheet that has to read on a dark palette, with sheet = Base and
+			ink = Text. The image must be opaque; an image in another format
+			is converted to RGB32 first.
+		*/
+		void invertLightness(QImage &image, const QColor &sheet = Qt::black,
+		                     const QColor &ink = Qt::white);
+
+		/**
+			The color of the grid dots on a sheet of color \a sheet: black,
+			or white on a black sheet. With \a inverted the sheet is about to
+			be shown with its lightness inverted (PaletteGraphicsView), where
+			black dots would come out as bright as the ink; the dots are then
+			a third of the way from the sheet color to black, which shows as
+			a soft gray.
+		*/
+		QColor gridDotColor(const QColor &sheet, bool inverted);
+
 		/**
 			WCAG 2 contrast ratio between two opaque colors, from 1 (equal)
 			to 21 (black on white). Normal text needs at least 4.5, large
@@ -87,6 +112,29 @@ namespace QET {
 			platform's accent color kept when it is readable.
 		*/
 		QPalette forFusion(const QPalette &platform);
+
+		/**
+			True when fewer than a fifth of the visible pixels are
+			saturated: black or gray line art, which is what element
+			previews and most of QET's own icons are.
+		*/
+		bool isLineArt(const QImage &image);
+
+		/**
+			The image with its lightness inverted and hue, saturation and
+			alpha kept: the darkest ink becomes light gray (220), white
+			becomes black. The rule misc/make_icon_themes.py applies when
+			it builds the dark icon theme.
+		*/
+		QImage invertedLightness(const QImage &image);
+
+		/**
+			A picture drawn for a white sheet, made to read on palette:
+			returned as is on a light palette, and with its lightness
+			inverted on a dark one when it is line art. Colored art is
+			left alone either way.
+		*/
+		QPixmap forPalette(const QPixmap &pixmap, const QPalette &palette);
 	}
 }

@@ -0,0 +1,180 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "qetstyle.h"
+
+#include <QApplication>
+#include <QImage>
+#include <QPainter>
+#include <QPixmap>
+#include <QStyleOption>
+#include <QWidget>
+
+#include "qetpalette.h"
+
+/**
+	@brief QETStyle::QETStyle
+	@param base the style to wrap; this object takes ownership of it.
+*/
+QETStyle::QETStyle(QStyle *base) :
+	QProxyStyle(base)
+{
+	setObjectName(base ? base->objectName() : QString());
+}
+
+/**
+	@brief QETStyle::isLineArt
+	The same rule misc/make_icon_themes.py uses to pick the icons that
+	get a dark variant: an icon is line art when fewer than 20% of its
+	visible pixels are saturated.
+*/
+bool QETStyle::isLineArt(const QImage &image)
+{
+	const QImage source = image.convertToFormat(QImage::Format_ARGB32);
+	int visible = 0;
+	int saturated = 0;
+	for (int y = 0; y < source.height(); ++y)
+	{
+		const QRgb *line = reinterpret_cast<const QRgb *>(source.constScanLine(y));
+		for (int x = 0; x < source.width(); ++x)
+		{
+			const QRgb pixel = line[x];
+			if (qAlpha(pixel) <= 64)
+				continue;
+			++visible;
+			const QColor color(pixel);
+			if (color.hslSaturationF() > 0.25 && color.value() > 60)
+				++saturated;
+		}
+	}
+	return visible > 0 && saturated < visible * 0.20;
+}
+
+/**
+	@brief QETStyle::hoverColor
+	The palette's highlight color is the accent users already know from
+	selections. On a dark palette it is too dark to read on a hovered
+	button face, so it is lightened, a step at a time, until it reaches
+	3:1 (WCAG 1.4.11) against the Light role: Fusion paints a hovered
+	auto-raise button with a gradient that runs from Button up to about
+	that color, and the icon has to read on the lightest part of it.
+*/
+QColor QETStyle::hoverColor(const QPalette &palette)
+{
+	const QColor face = palette.color(QPalette::Active, QPalette::Light);
+	QColor ink = palette.color(QPalette::Active, QPalette::Highlight);
+	// 3.5 rather than 3.0: the top of Fusion's hover gradient is a shade
+	// lighter than the Light role, so the icon needs some headroom there.
+	for (int step = 0; step < 20 && QET::Palette::contrastRatio(ink, face) < 3.5; ++step)
+		ink = ink.lighter(110);
+	return ink;
+}
+
+/**
+	@brief QETStyle::tinted
+	@return pixmap with every pixel set to color, alpha kept.
+*/
+QPixmap QETStyle::tinted(const QPixmap &pixmap, const QColor &color)
+{
+	QImage image = pixmap.toImage().convertToFormat(QImage::Format_ARGB32_Premultiplied);
+	QPainter painter(&image);
+	painter.setCompositionMode(QPainter::CompositionMode_SourceIn);
+	painter.fillRect(image.rect(), color);
+	painter.end();
+
+	QPixmap result = QPixmap::fromImage(image);
+	result.setDevicePixelRatio(pixmap.devicePixelRatio());
+	return result;
+}
+
+/**
+	@brief QETStyle::menuIcon
+	An icon for a highlighted menu item: Normal as the original, Active
+	as the original in the HighlightedText color when it is line art.
+	Cached per source icon, size and device pixel ratio, since menus
+	repaint on every pointer move.
+*/
+QIcon QETStyle::menuIcon(const QIcon &icon, const QPalette &palette, int size, qreal dpr) const
+{
+	const QString key = QString("%1/%2/%3/%4")
+	                    .arg(icon.cacheKey()).arg(size).arg(dpr)
+	                    .arg(palette.color(QPalette::Active, QPalette::HighlightedText).name());
+	auto it = menu_icons_.constFind(key);
+	if (it != menu_icons_.constEnd())
+		return *it;
+
+	const QPixmap normal = icon.pixmap(QSize(size, size), dpr, QIcon::Normal);
+	QIcon result;
+	result.addPixmap(normal, QIcon::Normal);
+	result.addPixmap(isLineArt(normal.toImage())
+	                 ? tinted(normal, palette.color(QPalette::Active, QPalette::HighlightedText))
+	                 : normal,
+	                 QIcon::Active);
+	result.addPixmap(icon.pixmap(QSize(size, size), dpr, QIcon::Disabled), QIcon::Disabled);
+	menu_icons_.insert(key, result);
+	return result;
+}
+
+/**
+	@brief QETStyle::drawControl
+	CE_MenuItem with an icon and a highlight: swap the icon for menuIcon()
+	so the base style's QIcon::Active request gets an icon that reads on
+	the highlight bar. Everything else goes to the base style.
+*/
+void QETStyle::drawControl(ControlElement element,
+                           const QStyleOption *option,
+                           QPainter *painter,
+                           const QWidget *widget) const
+{
+	if (element == CE_MenuItem)
+	{
+		const auto *item = qstyleoption_cast<const QStyleOptionMenuItem *>(option);
+		if (item && !item->icon.isNull()
+		    && (item->state & State_Selected) && (item->state & State_Enabled))
+		{
+			QStyleOptionMenuItem copy = *item;
+			const int size = pixelMetric(PM_SmallIconSize, option, widget);
+			const qreal dpr = widget ? widget->devicePixelRatio()
+			                         : QApplication::instance() ? qApp->devicePixelRatio() : 1.0;
+			copy.icon = menuIcon(item->icon, item->palette, size, dpr);
+			QProxyStyle::drawControl(element, &copy, painter, widget);
+			return;
+		}
+	}
+	QProxyStyle::drawControl(element, option, painter, widget);
+}
+
+/**
+	@brief QETStyle::generatedIconPixmap
+	QIcon::Active: a line-art icon comes back tinted in hoverColor(),
+	alpha kept, so the hovered icon differs from the normal one on both
+	light and dark palettes. Colored icons and every
+	other mode go to the base style.
+*/
+QPixmap QETStyle::generatedIconPixmap(QIcon::Mode mode,
+                                      const QPixmap &pixmap,
+                                      const QStyleOption *option) const
+{
+	if (mode != QIcon::Active || pixmap.isNull())
+		return QProxyStyle::generatedIconPixmap(mode, pixmap, option);
+
+	if (!isLineArt(pixmap.toImage()))
+		return QProxyStyle::generatedIconPixmap(mode, pixmap, option);
+
+	const QPalette palette = option ? option->palette : QApplication::palette();
+	return tinted(pixmap, hoverColor(palette));
+}
@@ -0,0 +1,73 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef QET_STYLE_H
+#define QET_STYLE_H
+
+#include <QHash>
+#include <QIcon>
+#include <QProxyStyle>
+
+/**
+	@brief The QETStyle class
+	A proxy over the running widget style that gives icons a hover state.
+
+	QToolButton, QTabBar and item views ask the application style for the
+	QIcon::Active pixmap of an icon while the mouse is over it. Every
+	built-in style returns the icon unchanged for that mode, so only the
+	button frame changes on hover, and on a dark palette Fusion's frame is
+	too faint to see (GitHub #870). This proxy answers QIcon::Active for
+	line-art icons with the icon tinted in the palette's highlight color,
+	lightened when needed to reach 3:1 on a button face, so the icon
+	itself changes on both light and dark palettes. Colored icons keep
+	their colors. Every other mode is left to the base style.
+
+	Fusion also asks for QIcon::Active for the icon of a highlighted menu
+	item and paints it on the highlight bar, where the hover tint would
+	vanish. The generated pixmap is cached per icon and cannot tell a
+	menu from a toolbar, so drawControl(CE_MenuItem) hands the base style
+	an icon whose Active pixmap is the icon in the highlighted-text color.
+*/
+class QETStyle : public QProxyStyle
+{
+	Q_OBJECT
+
+	public:
+		explicit QETStyle(QStyle *base);
+		~QETStyle() override = default;
+
+		QPixmap generatedIconPixmap(QIcon::Mode mode,
+		                            const QPixmap &pixmap,
+		                            const QStyleOption *option) const override;
+		void drawControl(ControlElement element,
+		                 const QStyleOption *option,
+		                 QPainter *painter,
+		                 const QWidget *widget = nullptr) const override;
+
+		/// True when fewer than a fifth of the visible pixels are saturated.
+		static bool isLineArt(const QImage &image);
+		/// The highlight color, lightened until it reads at 3:1 on a button.
+		static QColor hoverColor(const QPalette &palette);
+		/// pixmap with every pixel set to color, alpha kept.
+		static QPixmap tinted(const QPixmap &pixmap, const QColor &color);
+
+	private:
+		QIcon menuIcon(const QIcon &icon, const QPalette &palette, int size, qreal dpr) const;
+		mutable QHash<QString, QIcon> menu_icons_;
+};
+
+#endif
@@ -0,0 +1,265 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "conductorcolortoolbutton.h"
+
+#include "../QPropertyUndoCommand/qpropertyundocommand.h"
+#include "../diagram.h"
+#include "../diagramcontent.h"
+#include "../diagramview.h"
+#include "../lastusedstyle.h"
+#include "../qetdiagrameditor.h"
+#include "../projectview.h"
+#include "../qetgraphicsitem/conductor.h"
+#include "../conductorproperties.h"
+
+#include <QColorDialog>
+#include <QMenu>
+#include <QPainter>
+#include <QPixmap>
+
+namespace {
+	/**
+		The colours an electrician reaches for, in the order the trade
+		names them: the three phases, neutral, earth, then the ones used
+		for control and extra-low-voltage circuits. Not a standard in
+		itself -- IEC 60445 only fixes blue for neutral and green/yellow
+		for protective earth -- but it covers the wiring a schematic
+		actually shows, which is what makes the toolbar worth a click.
+	*/
+	struct NamedColor { const char *context_name; QColor color; };
+
+	QList<NamedColor> standardColors()
+	{
+		return {
+			{QT_TRANSLATE_NOOP("ConductorColorToolButton", "Noir"),        QColor(0x00, 0x00, 0x00)},
+			{QT_TRANSLATE_NOOP("ConductorColorToolButton", "Marron"),      QColor(0x7B, 0x3F, 0x00)},
+			{QT_TRANSLATE_NOOP("ConductorColorToolButton", "Gris"),        QColor(0x80, 0x80, 0x80)},
+			{QT_TRANSLATE_NOOP("ConductorColorToolButton", "Bleu"),        QColor(0x00, 0x00, 0xFF)},
+			{QT_TRANSLATE_NOOP("ConductorColorToolButton", "Vert"),        QColor(0x00, 0x80, 0x00)},
+			{QT_TRANSLATE_NOOP("ConductorColorToolButton", "Rouge"),       QColor(0xFF, 0x00, 0x00)},
+			{QT_TRANSLATE_NOOP("ConductorColorToolButton", "Orange"),      QColor(0xFF, 0x80, 0x00)},
+			{QT_TRANSLATE_NOOP("ConductorColorToolButton", "Violet"),      QColor(0x80, 0x00, 0x80)},
+			{QT_TRANSLATE_NOOP("ConductorColorToolButton", "Blanc"),       QColor(0xFF, 0xFF, 0xFF)},
+		};
+	}
+
+	const int MAX_RECENT = 6;
+}
+
+/**
+	@brief ConductorColorToolButton::ConductorColorToolButton
+	@param editor : the diagram editor this button acts on
+	@param parent
+*/
+ConductorColorToolButton::ConductorColorToolButton(QETDiagramEditor *editor, QWidget *parent) :
+	QToolButton(parent),
+	m_editor(editor)
+{
+	setPopupMode(QToolButton::InstantPopup);
+	setToolTip(tr("Couleur de conducteur"));
+	setStatusTip(tr("Applique une couleur aux conducteurs sélectionnés, et l'utilise pour les prochains conducteurs tracés",
+			"status bar tip"));
+
+	m_current = LastUsedStyle::hasConductorColor() ? LastUsedStyle::conductorColor()
+						      : QColor(Qt::black);
+	setMenu(new QMenu(this));
+	rebuildMenu();
+	setSwatch(m_current);
+}
+
+/**
+	@brief ConductorColorToolButton::currentView
+	@return the folio being edited, or nullptr when no project is open.
+	Goes through the project view because QETDiagramEditor keeps its own
+	currentDiagramView() private.
+*/
+DiagramView *ConductorColorToolButton::currentView() const
+{
+	ProjectView *pv = m_editor ? m_editor->currentProjectView() : nullptr;
+	return pv ? pv->currentDiagram() : nullptr;
+}
+
+/**
+	@brief ConductorColorToolButton::updateEnabledState
+	Greyed out when there is no folio to act on, or when the project is
+	read-only -- the same rule the other conductor actions follow.
+*/
+void ConductorColorToolButton::updateEnabledState()
+{
+	DiagramView *dv = currentView();
+	setEnabled(dv && dv->diagram() && !dv->diagram()->isReadOnly());
+}
+
+/**
+	@brief ConductorColorToolButton::rebuildMenu
+	The standard colours never change; the recent ones do, so the menu is
+	rebuilt rather than kept in sync entry by entry.
+*/
+void ConductorColorToolButton::rebuildMenu()
+{
+	QMenu *m = menu();
+	m->clear();
+
+	for (const auto &nc : standardColors())
+	{
+		const QColor c = nc.color;
+		QAction *a = m->addAction(swatchIcon(c),
+					  tr(nc.context_name));
+		connect(a, &QAction::triggered, this, [this, c]() { applyColor(c); });
+	}
+
+	if (!m_recent.isEmpty())
+	{
+		m->addSeparator();
+		QAction *title = m->addAction(tr("Récemment utilisées"));
+		title->setEnabled(false);
+		for (const QColor &c : std::as_const(m_recent))
+		{
+			QAction *a = m->addAction(swatchIcon(c), c.name());
+			connect(a, &QAction::triggered, this, [this, c]() { applyColor(c); });
+		}
+	}
+
+	m->addSeparator();
+	QAction *other = m->addAction(tr("Autre couleur…"));
+	connect(other, &QAction::triggered, this, &ConductorColorToolButton::chooseOtherColor);
+}
+
+/**
+	@brief ConductorColorToolButton::applyColor
+	Recolour the selected conductors, and remember the colour for the next
+	one drawn.
+	@param color
+*/
+void ConductorColorToolButton::applyColor(const QColor &color)
+{
+	if (!color.isValid()) {
+		return;
+	}
+
+		//Always: this is the half that works with nothing selected.
+	LastUsedStyle::setConductorColor(color);
+	rememberRecent(color);
+	setSwatch(color);
+
+	DiagramView *dv = currentView();
+	if (!dv) {
+		return;
+	}
+	Diagram *diagram = dv->diagram();
+	if (!diagram || diagram->isReadOnly()) {
+		return;
+	}
+
+	DiagramContent dc(diagram);
+	const auto conductors = dc.conductors(DiagramContent::AnyConductor);
+	if (conductors.isEmpty()) {
+		return;
+	}
+
+	QUndoCommand *undo = new QUndoCommand(tr("Modifier la couleur de %n conducteur(s)",
+						 "undo caption", conductors.count()));
+	int changed = 0;
+	for (Conductor *conductor : conductors)
+	{
+		ConductorProperties before = conductor->properties();
+		if (before.color == color) {
+			continue;
+		}
+		ConductorProperties after = before;
+		after.color = color;
+
+		QVariant old_value, new_value;
+		old_value.setValue(before);
+		new_value.setValue(after);
+		new QPropertyUndoCommand(conductor, "properties", old_value, new_value, undo);
+		++changed;
+	}
+
+		//Every selected conductor was already this colour: pushing an
+		//empty command would put a no-op step in the undo stack.
+	if (changed) {
+		diagram->undoStack().push(undo);
+	} else {
+		delete undo;
+	}
+}
+
+/**
+	@brief ConductorColorToolButton::chooseOtherColor
+*/
+void ConductorColorToolButton::chooseOtherColor()
+{
+	const QColor c = QColorDialog::getColor(m_current, this,
+					        tr("Choisir une couleur de conducteur"));
+	if (c.isValid()) {
+		applyColor(c);
+	}
+}
+
+/**
+	@brief ConductorColorToolButton::rememberRecent
+	Most recent first, no duplicates, capped.
+	@param color
+*/
+void ConductorColorToolButton::rememberRecent(const QColor &color)
+{
+		//A colour that is already one row up in the standard list would
+		//only appear twice, under a hex name it does not need.
+	for (const auto &nc : standardColors()) {
+		if (nc.color == color) {
+			return;
+		}
+	}
+
+	m_recent.removeAll(color);
+	m_recent.prepend(color);
+	while (m_recent.size() > MAX_RECENT) {
+		m_recent.removeLast();
+	}
+	rebuildMenu();
+}
+
+/**
+	@brief ConductorColorToolButton::setSwatch
+	@param color
+*/
+void ConductorColorToolButton::setSwatch(const QColor &color)
+{
+	m_current = color;
+	setIcon(swatchIcon(color));
+}
+
+/**
+	@brief ConductorColorToolButton::swatchIcon
+	@param color
+	@return a plain square of that colour, outlined so that white and very
+	light colours are still visible against the toolbar.
+*/
+QIcon ConductorColorToolButton::swatchIcon(const QColor &color)
+{
+	QPixmap pix(16, 16);
+	pix.fill(Qt::transparent);
+	QPainter p(&pix);
+	p.setRenderHint(QPainter::Antialiasing, false);
+	p.setBrush(color);
+	p.setPen(QPen(QColor(0x40, 0x40, 0x40), 1));
+	p.drawRect(0, 0, 15, 15);
+	p.end();
+	return QIcon(pix);
+}
@@ -0,0 +1,69 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef CONDUCTORCOLORTOOLBUTTON_H
+#define CONDUCTORCOLORTOOLBUTTON_H
+
+#include <QColor>
+#include <QList>
+#include <QToolButton>
+
+class QETDiagramEditor;
+class DiagramView;
+
+/**
+	@brief The ConductorColorToolButton class
+	One-click conductor colour, from the "Schéma" toolbar.
+
+	Picking a colour does two things: it recolours every conductor
+	currently selected (one undo command for the lot), and it becomes the
+	colour of the next conductor drawn this session, through the existing
+	LastUsedStyle mechanism. Either half is useful on its own -- with
+	nothing selected it only sets the pen for what comes next.
+
+	This deliberately stores nothing in the project and nothing in
+	QSettings. It is the same session-scoped "what did I just use" idea
+	LastUsedStyle already implements; named presets that persist per
+	project are a separate, larger feature (upstream issue #461) that
+	needs a maintainer decision first.
+*/
+class ConductorColorToolButton : public QToolButton
+{
+		Q_OBJECT
+
+	public:
+		explicit ConductorColorToolButton(QETDiagramEditor *editor,
+						  QWidget *parent = nullptr);
+
+	public slots:
+		void updateEnabledState();
+
+	private:
+		DiagramView *currentView() const;
+		void rebuildMenu();
+		void applyColor(const QColor &color);
+		void chooseOtherColor();
+		void rememberRecent(const QColor &color);
+		void setSwatch(const QColor &color);
+		static QIcon swatchIcon(const QColor &color);
+
+		QETDiagramEditor *m_editor = nullptr;
+		QList<QColor> m_recent;
+		QColor m_current;
+};
+
+#endif // CONDUCTORCOLORTOOLBUTTON_H
@@ -95,8 +95,12 @@ add_executable(
  tst_qetpalette
  tst_qetpalette.cpp
  inkcontrast.h
+  ${QET_DIR}/sources/palettegraphicsview.cpp
+  ${QET_DIR}/sources/palettegraphicsview.h
  ${QET_DIR}/sources/qetpalette.cpp
-  ${QET_DIR}/sources/qetpalette.h)
+  ${QET_DIR}/sources/qetpalette.h
+  ${QET_DIR}/sources/ElementsCollection/elementpreviewdelegate.cpp
+  ${QET_DIR}/sources/ElementsCollection/elementpreviewdelegate.h)
 add_test(NAME tst_qetpalette COMMAND tst_qetpalette)
 target_include_directories(tst_qetpalette PRIVATE ${QET_DIR}/sources)
 target_link_libraries(tst_qetpalette PRIVATE Qt::Test Qt::Widgets)
@@ -110,6 +114,7 @@ add_executable(
  ${QET_DIR}/sources/qeticons.cpp
  ${QET_DIR}/sources/qeticons.h
  ${QET_DIR}/sources/qetpalette.cpp
+  ${QET_DIR}/sources/qetstyle.cpp
  ${QET_DIR}/sources/qetpalette.h
  ${QET_DIR}/ico/icon-themes.qrc)
 add_test(NAME tst_qeticons COMMAND tst_qeticons)
@@ -152,7 +157,12 @@ add_test(NAME tst_crashhandler COMMAND tst_crashhandler)
 target_include_directories(tst_crashhandler PRIVATE ${QET_DIR}/sources)
 # Qt::Xml because crashhandler.cpp includes qetversion.h for the header it
 # builds at install() time, and that pulls in QDomElement.
-target_link_libraries(tst_crashhandler PRIVATE Qt::Test Qt::Xml ${Backtrace_LIBRARIES})
+if(Backtrace_FOUND)
+  target_link_libraries(tst_crashhandler PRIVATE
+    Qt::Test Qt::Xml ${Backtrace_LIBRARIES})
+else()
+  target_link_libraries(tst_crashhandler PRIVATE Qt::Test Qt::Xml)
+endif()

 # The crash-dump bookkeeping from #905: which dumps get listed, offered and
 # deleted, and what redact() masks. qetlogger.cpp needs exactly one symbol
@@ -171,7 +181,12 @@ target_include_directories(tst_crashdumps PRIVATE
  ${QET_DIR}/sources
  ${QET_DIR}/sources/NameList
  ${QET_DIR}/pugixml/src)
-target_link_libraries(tst_crashdumps PRIVATE Qt::Test Qt::Widgets Qt::Xml ${Backtrace_LIBRARIES})
+if(Backtrace_FOUND)
+  target_link_libraries(tst_crashdumps PRIVATE
+    Qt::Test Qt::Widgets Qt::Xml ${Backtrace_LIBRARIES})
+else()
+  target_link_libraries(tst_crashdumps PRIVATE Qt::Test Qt::Widgets Qt::Xml)
+endif()

 add_executable(
  tst_menubarkeyboard
@@ -38,9 +38,8 @@ namespace QET {
 			image is also written there as <row>-<name>.png so a failure
 			can be looked at.
 		*/
-		inline QImage grab(QWidget *widget, const char *name)
+		inline QImage dump(const QImage &image, const char *name)
 		{
-			const QImage image = widget->grab().toImage();
 			const QByteArray dir = qgetenv("QET_TEST_DUMP_DIR");
 			if (!dir.isEmpty())
 				image.save(QString("%1/%2-%3.png").arg(QString::fromLocal8Bit(dir),
@@ -48,28 +47,55 @@ namespace QET {
 			return image;
 		}

+		inline QImage grab(QWidget *widget, const char *name)
+		{
+			return dump(widget->grab().toImage(), name);
+		}
+
 		/**
 			Contrast between the background of a rendered widget (its most
 			frequent color) and the ink drawn on it (the pixel whose
 			luminance differs most from the background), inside rect.
 		*/
-		inline double inkContrast(const QImage &image, const QRect &rect)
+		inline QHash<QRgb, int> histogram(const QImage &image, const QRect &rect)
 		{
-			QHash<QRgb, int> histogram;
+			QHash<QRgb, int> counts;
 			for (int y = rect.top(); y <= rect.bottom(); ++y)
 				for (int x = rect.left(); x <= rect.right(); ++x)
-					++histogram[image.pixel(x, y)];
+					++counts[image.pixel(x, y)];
+			return counts;
+		}

-			QRgb background = 0;
+		/// The most frequent color inside rect.
+		inline QRgb background(const QImage &image, const QRect &rect)
+		{
+			const QHash<QRgb, int> counts = histogram(image, rect);
+			QRgb color = 0;
 			int best = -1;
-			for (auto it = histogram.cbegin(); it != histogram.cend(); ++it)
-				if (it.value() > best) { best = it.value(); background = it.key(); }
+			for (auto it = counts.cbegin(); it != counts.cend(); ++it)
+				if (it.value() > best) { best = it.value(); color = it.key(); }
+			return color;
+		}

+		/// The color inside rect that contrasts most with the background: the ink.
+		inline QRgb ink(const QImage &image, const QRect &rect)
+		{
+			const QHash<QRgb, int> counts = histogram(image, rect);
+			const QColor bg(background(image, rect));
+			QRgb color = bg.rgb();
 			double contrast = 1.0;
-			for (auto it = histogram.cbegin(); it != histogram.cend(); ++it)
-				contrast = qMax(contrast, QET::Palette::contrastRatio(QColor(background),
-				                                                      QColor(it.key())));
-			return contrast;
+			for (auto it = counts.cbegin(); it != counts.cend(); ++it)
+			{
+				const double c = QET::Palette::contrastRatio(bg, QColor(it.key()));
+				if (c > contrast) { contrast = c; color = it.key(); }
+			}
+			return color;
+		}
+
+		inline double inkContrast(const QImage &image, const QRect &rect)
+		{
+			return QET::Palette::contrastRatio(QColor(background(image, rect)),
+			                                   QColor(ink(image, rect)));
 		}
 	}
 }
@@ -100,7 +100,9 @@ void tst_CrashHandler::formatsTheHandledSignals()
 {
 	QCOMPARE(format(SIGSEGV), QByteArray::number(SIGSEGV));
 	QCOMPARE(format(SIGABRT), QByteArray::number(SIGABRT));
+#if defined(SIGBUS)
 	QCOMPARE(format(SIGBUS), QByteArray::number(SIGBUS));
+#endif
 	QCOMPARE(format(SIGFPE), QByteArray::number(SIGFPE));
 	QCOMPARE(format(SIGILL), QByteArray::number(SIGILL));
 }
@@ -21,6 +21,12 @@
 #include <QMenuBar>
 #include <QShortcut>

+#ifdef Q_OS_MACOS
+// Exported from QtGui but declared in qkeysequence.h only for the
+// documentation build; Qt's own docs say to declare it like this.
+Q_GUI_EXPORT void qt_set_sequence_auto_mnemonic(bool b);
+#endif
+
 /*
 	F10 should open the menu bar, as it does in most applications and as
 	someone working without a mouse will expect. Qt provides this on Windows
@@ -38,6 +44,7 @@ class TstMenuBarKeyboard : public QObject
 	Q_OBJECT

 	private slots:
+		void initTestCase();
 		void altLetterOpensMenu();      // control -- must pass, or nothing below means anything
 		void plainF10DoesNothingInQt(); // the gap being filled
 		void shortcutOpensMenuBar();    // the mechanism QETMainWindow uses
@@ -48,6 +55,13 @@ namespace {
 QMainWindow *makeWindow(QMenu **file_menu)
 {
 	auto *w = new QMainWindow;
+#ifdef Q_OS_MACOS
+	// A QMenuBar is native on macOS: its menus live in the system menu
+	// bar, outside the Qt widget tree, where QTest key events never reach
+	// them and QMenu::isVisible() stays false. The in-window bar runs the
+	// same QMenuBar code the other platforms use.
+	w->menuBar()->setNativeMenuBar(false);
+#endif
 	*file_menu = w->menuBar()->addMenu(QStringLiteral("&File"));
 	(*file_menu)->addAction(QStringLiteral("Quit"));
 	w->menuBar()->addMenu(QStringLiteral("&Edit"))->addAction(QStringLiteral("Copy"));
@@ -60,6 +74,18 @@ QMainWindow *makeWindow(QMenu **file_menu)

 }

+/*
+	macOS has no Alt+letter menu mnemonics, so Qt does not turn "&File"
+	into a shortcut there (qt_set_sequence_auto_mnemonic is off). The
+	control below needs one; switch mnemonics on for this process.
+*/
+void TstMenuBarKeyboard::initTestCase()
+{
+#ifdef Q_OS_MACOS
+	qt_set_sequence_auto_mnemonic(true);
+#endif
+}
+
 /*
 	The control. Alt and a menu's letter is known to work, so if this fails
 	the environment cannot open menus at all and the other two tests are
@@ -18,15 +18,20 @@
 #include <QtTest>
 #include <QApplication>
 #include <QDir>
+#include <QFile>
 #include <QIcon>
 #include <QMainWindow>
+#include <QMenu>
+#include <QPainter>
 #include <QStyleFactory>
+#include <QStyleOption>
 #include <QToolBar>
 #include <QToolButton>

 #include "inkcontrast.h"
 #include "qeticons.h"
 #include "qetpalette.h"
+#include "qetstyle.h"

 /**
 	Checks on QET's two icon themes, "qet" and "qet-dark", generated by
@@ -34,11 +39,15 @@
 	table that uses them.

 	Every icon name must resolve in both themes. The dark theme's files
-	must be light ink. A toolbar button painted with Fusion must show its
-	icon at 3:1 (WCAG 1.4.11) in both themes, with the disabled state
-	reading weaker than the enabled one, which is what was reversed on
-	macOS before (GitHub #466, #870). And the icons the elements panel
-	draws in its 50 px slots must stay small.
+	must read on the dark palette, and an icon drawn as a light object
+	(a page sheet, the PDF import icon of GitHub #919) must come through
+	the dark theme untouched rather than inverted into a black page.
+	QET's own vector icons must serve every size in both themes. A
+	toolbar button painted with Fusion must show its icon at 3:1 (WCAG
+	1.4.11) in both themes, with the disabled state reading weaker than
+	the enabled one, which is what was reversed on macOS before (GitHub
+	#466, #870). And the icons the elements panel draws in its 50 px
+	slots must stay small.
 */
 class tst_qeticons : public QObject
 {
@@ -47,9 +56,16 @@ class tst_qeticons : public QObject
 	private slots:
 		void initTestCase();
 		void everyIconResolvesInBothThemes();
-		void darkThemeFilesAreLightInk();
+		void darkThemeFilesReadOnDarkPalette();
+		void lightIconsStayLightInDarkTheme();
+		void scalableIconsServeEverySize();
 		void toolbarIconIsReadable_data();
 		void toolbarIconIsReadable();
+		void hoverChangesTheIcon_data();
+		void hoverChangesTheIcon();
+		void coloredIconKeepsItsColorsOnHover();
+		void menuIconReadsOnHighlight_data();
+		void menuIconReadsOnHighlight();
 		void panelProjectIconStaysSmall();
 };

@@ -70,18 +86,26 @@ namespace {
 		return names;
 	}

-	/// Lightness of the lightest visible pixel: the ink, in a dark-theme file.
-	double maxLightness(const QImage &image)
+	/**
+		Mean color of the visible pixels: what the icon reads as, taken
+		as a whole, on the background behind it. A page-shaped icon whose
+		white body was inverted keeps a light border, so the lightest
+		pixel would pass it; the mean does not.
+	*/
+	QColor meanVisibleColor(const QImage &image)
 	{
-		double max = 0.0;
+		qint64 r = 0, g = 0, b = 0, n = 0;
 		for (int y = 0; y < image.height(); ++y)
 			for (int x = 0; x < image.width(); ++x)
 			{
 				const QColor c = image.pixelColor(x, y);
-				if (c.alpha() > 64) max = qMax(max, c.lightnessF());
+				if (c.alpha() <= 64) continue;
+				r += c.red(); g += c.green(); b += c.blue(); ++n;
 			}
-		return max;
+		return n ? QColor(r / n, g / n, b / n) : QColor();
 	}
+
+	const QStringList kSizes = {"16x16", "22x22", "32x32", "48x48", "128x128"};
 }

 void tst_qeticons::initTestCase()
@@ -111,27 +135,109 @@ void tst_qeticons::everyIconResolvesInBothThemes()
 		QVERIFY2(!QIcon::fromTheme(name).pixmap(22).isNull(), qPrintable(name));
 }

-void tst_qeticons::darkThemeFilesAreLightInk()
+/**
+	Every file the generator put in the dark theme, taken as a whole,
+	must reach 3:1 against the dark palette's window color. Inverted
+	line art passes by a wide margin; an inverted light object (a white
+	page turned black) sits below 2:1 and fails, which is the defect
+	misc/make_icon_themes.py now avoids by leaving such icons to the
+	light theme.
+*/
+void tst_qeticons::darkThemeFilesReadOnDarkPalette()
 {
+	const QColor window = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Window);
 	int checked = 0;
-	for (const QString &size : {"16x16", "22x22", "32x32"})
+	for (const QString &size : kSizes)
 	{
 		QDir dir(QString(":/ico/themes/qet-dark/%1").arg(size));
 		for (const QString &file : dir.entryList({"*.png"}, QDir::Files))
 		{
 			const QImage dark(dir.filePath(file));
-			const QImage light(QString(":/ico/themes/qet/%1/%2").arg(size, file));
-			QVERIFY2(!dark.isNull() && !light.isNull(), qPrintable(file));
-			// A page-shaped icon keeps its white fill dark after inversion,
-			// so the mean would mislead; what matters is that the ink is light.
-			QVERIFY2(maxLightness(dark) >= 0.8,
-			         qPrintable(QString("%1/%2 has no light ink").arg(size, file)));
+			QVERIFY2(!dark.isNull(), qPrintable(file));
+			const QColor mean = meanVisibleColor(dark);
+			QVERIFY2(mean.isValid(), qPrintable(file));
+			const double contrast = QET::Palette::contrastRatio(mean, window);
+			QVERIFY2(contrast >= kIconRatio,
+			         qPrintable(QString("%1/%2 reads %3:1 on the dark window").arg(size, file).arg(contrast)));
 			++checked;
 		}
 	}
 	QVERIFY(checked > 100);
 }

+/**
+	Icons drawn as a light object are not in the dark theme; the theme
+	inherits them from "qet". Asking the dark theme for them must return
+	the light art, not a dark page (GitHub #919, the PDF import icon).
+*/
+void tst_qeticons::lightIconsStayLightInDarkTheme()
+{
+	const QColor window = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Window);
+	QIcon::setThemeName(QStringLiteral("qet-dark"));
+	// The folio family is an SVG from 22 px up; their 16 px files are
+	// still the light page art, as is the background swatch at 22 px.
+	const QList<QPair<QString, int>> icons = {
+		{"diagram", 16}, {"label", 16}, {"folio-new", 16}, {"folio-delete", 16},
+		{"folio-properties", 16}, {"diagram_bg", 22}};
+	for (const auto &[name, size] : icons)
+	{
+		QVERIFY2(!QFile::exists(QString(":/ico/themes/qet-dark/%1x%1/%2.png").arg(size).arg(name)),
+		         qPrintable(QString("%1 has a dark copy; the generator inverted a light icon").arg(name)));
+		const QImage image = QIcon::fromTheme(name).pixmap(size).toImage();
+		QVERIFY2(!image.isNull(), qPrintable(name));
+		const QColor mean = meanVisibleColor(image);
+		QVERIFY2(mean.lightnessF() > 0.6,
+		         qPrintable(QString("%1 comes out dark in the dark theme (lightness %2)")
+		                    .arg(name).arg(mean.lightnessF())));
+		QVERIFY2(QET::Palette::contrastRatio(mean, window) >= kIconRatio, qPrintable(name));
+	}
+}
+
+/**
+	QET's own vector icons live in ico/scalable/: one file for every size
+	from the toolbar up, with a recolored copy in the dark theme. Each
+	must resolve in both themes at 22, 24, 32 and 64 px, dark ink on the
+	light theme and light ink on the dark one, with no 22 px PNG left
+	beside it. Fusion's toolbar slot is 24 px, so the files are drawn on
+	a 24 px canvas and their one pixel lines land on whole pixels there.
+*/
+void tst_qeticons::scalableIconsServeEverySize()
+{
+	const QDir scalable(":/ico/themes/qet/scalable");
+	QStringList names;
+	for (const QString &file : scalable.entryList({"*.svg"}, QDir::Files))
+		names << file.section('.', 0, -2);
+	for (const QString &name : {"pdf-import", "folio-new", "folio-delete", "folio-properties", "diagram", "label"})
+		QVERIFY2(names.contains(name), qPrintable(name + " is not in the scalable folder"));
+
+	const QByteArray dump = qgetenv("QET_TEST_DUMP_DIR");
+	for (const QString &name : names)
+	{
+		QVERIFY2(QFile::exists(QString(":/ico/themes/qet-dark/scalable/%1.svg").arg(name)), qPrintable(name));
+		QVERIFY2(!QFile::exists(QString(":/ico/themes/qet/22x22/%1.png").arg(name)),
+		         qPrintable(QString("%1 still has a 22 px PNG that hides the SVG").arg(name)));
+		for (const QString &theme : {"qet", "qet-dark"})
+		{
+			QIcon::setThemeName(theme);
+			const QIcon icon = QIcon::fromTheme(name);
+			QVERIFY2(!icon.isNull(), qPrintable(name));
+			for (int size : {22, 24, 32, 64})
+			{
+				const QPixmap pixmap = icon.pixmap(size);
+				QCOMPARE(pixmap.width(), size);
+				if (!dump.isEmpty())
+					pixmap.save(QString("%1/%2-%3-%4.png").arg(QString::fromLocal8Bit(dump), name, theme).arg(size));
+				const QColor mean = meanVisibleColor(pixmap.toImage());
+				QVERIFY2(mean.isValid(), qPrintable(QString("%1 in %2 at %3 px is empty").arg(name, theme).arg(size)));
+				if (theme == "qet")
+					QVERIFY2(mean.lightnessF() < 0.5, qPrintable(QString("%1 light theme at %2 px: lightness %3").arg(name).arg(size).arg(mean.lightnessF())));
+				else
+					QVERIFY2(mean.lightnessF() > 0.6, qPrintable(QString("%1 dark theme at %2 px: lightness %3").arg(name).arg(size).arg(mean.lightnessF())));
+			}
+		}
+	}
+}
+
 void tst_qeticons::toolbarIconIsReadable_data()
 {
 	QTest::addColumn<QString>("theme");
@@ -178,6 +284,169 @@ void tst_qeticons::toolbarIconIsReadable()
 	                    .arg(disabled_contrast).arg(enabled_contrast)));
 }

+namespace {
+	/**
+		Paint a tool button through the style with the given extra states,
+		the way QToolButton::paintEvent does, so hover can be rendered
+		without a real pointer.
+	*/
+	QImage renderToolButton(QToolButton *button, QStyle::State extra, const char *name)
+	{
+		QStyleOptionToolButton option;
+		option.initFrom(button);
+		option.state |= QStyle::State_Enabled | QStyle::State_AutoRaise | QStyle::State_Raised | extra;
+		option.icon = button->icon();
+		option.iconSize = button->iconSize();
+		option.subControls = QStyle::SC_ToolButton;
+		option.features = QStyleOptionToolButton::None;
+		option.toolButtonStyle = Qt::ToolButtonIconOnly;
+
+		QImage image(button->size(), QImage::Format_ARGB32_Premultiplied);
+		image.fill(option.palette.color(QPalette::Window));
+		QPainter painter(&image);
+		button->style()->drawComplexControl(QStyle::CC_ToolButton, &option, &painter, button);
+		painter.end();
+		return QET::Test::dump(image, name);
+	}
+
+	QToolButton *toolButton(QMainWindow &window, const QIcon &icon)
+	{
+		QToolBar *toolbar = window.addToolBar("view");
+		auto *button = new QToolButton;
+		button->setIcon(icon);
+		button->setAutoRaise(true);
+		toolbar->addWidget(button);
+		window.resize(300, 100);
+		window.show();
+		return button;
+	}
+}
+
+void tst_qeticons::hoverChangesTheIcon_data()
+{
+	QTest::addColumn<QString>("theme");
+	QTest::addColumn<QPalette>("palette");
+	QTest::addColumn<bool>("checked");
+	QTest::newRow("light") << "qet" << QET::Palette::fusionLight() << false;
+	QTest::newRow("dark") << "qet-dark" << QET::Palette::fusionDark() << false;
+	// A toggle that is on: Fusion draws it sunken, and hovering it changes
+	// nothing in the frame, so the icon is the only hover signal there.
+	QTest::newRow("light-checked") << "qet" << QET::Palette::fusionLight() << true;
+	QTest::newRow("dark-checked") << "qet-dark" << QET::Palette::fusionDark() << true;
+}
+
+/**
+	Hovering a line-art icon must change the icon itself, not only the
+	button frame, and the hovered icon must still reach 3:1 (GitHub #870).
+	QETStyle answers QIcon::Active with the icon tinted in the highlight
+	color; the built-in styles return it unchanged.
+*/
+void tst_qeticons::hoverChangesTheIcon()
+{
+	QFETCH(QString, theme);
+	QFETCH(QPalette, palette);
+	QFETCH(bool, checked);
+	QIcon::setThemeName(theme);
+	QApplication::setStyle(new QETStyle(QStyleFactory::create("Fusion")));
+	QApplication::setPalette(palette);
+
+	QMainWindow window;
+	QToolButton *button = toolButton(window, QIcon::fromTheme("zoom-fit-best"));
+	button->setCheckable(checked);
+	button->setChecked(checked);
+	QVERIFY(QTest::qWaitForWindowExposed(&window));
+
+	const QStyle::State on = checked ? (QStyle::State_On | QStyle::State_Sunken) : QStyle::State_None;
+	const QImage normal = renderToolButton(button, on, "normal");
+	const QImage hover = renderToolButton(button, on | QStyle::State_MouseOver, "hover");
+	// Inside the frame Fusion draws around a hovered button, so the ink
+	// measured is the icon's, not the frame's.
+	const QRect inside = button->rect().adjusted(3, 3, -3, -3);
+	const QColor normal_ink(QET::Test::ink(normal, inside));
+	const QColor hover_ink(QET::Test::ink(hover, inside));
+	QVERIFY2(hover_ink != normal_ink,
+	         qPrintable(QString("hover leaves the icon ink at %1").arg(normal_ink.name())));
+
+	// The tint, give or take the icon's own anti-aliasing.
+	const QColor expected = QETStyle::hoverColor(palette);
+	const int distance = qMax(qMax(qAbs(hover_ink.red() - expected.red()),
+	                               qAbs(hover_ink.green() - expected.green())),
+	                          qAbs(hover_ink.blue() - expected.blue()));
+	QVERIFY2(distance <= 16,
+	         qPrintable(QString("hovered ink %1, expected %2").arg(hover_ink.name(), expected.name())));
+
+	const double hover_contrast = QET::Test::inkContrast(hover, inside);
+	QVERIFY2(hover_contrast >= kIconRatio,
+	         qPrintable(QString("hovered icon: %1").arg(hover_contrast)));
+}
+
+/**
+	A colored icon (old Oxygen art) is not line art, so hover leaves its
+	pixels alone.
+*/
+void tst_qeticons::coloredIconKeepsItsColorsOnHover()
+{
+	QIcon::setThemeName(QStringLiteral("qet"));
+	QApplication::setStyle(new QETStyle(QStyleFactory::create("Fusion")));
+	QApplication::setPalette(QET::Palette::fusionLight());
+
+	const QIcon icon = QIcon::fromTheme("document-open");   // colored Oxygen art
+	QVERIFY(!icon.isNull());
+	const QPixmap normal = icon.pixmap(QSize(22, 22), 1.0, QIcon::Normal);
+	const QPixmap active = icon.pixmap(QSize(22, 22), 1.0, QIcon::Active);
+	QVERIFY(!QETStyle::isLineArt(normal.toImage()));
+	QCOMPARE(active.toImage(), normal.toImage());
+}
+
+void tst_qeticons::menuIconReadsOnHighlight_data()
+{
+	toolbarIconIsReadable_data();
+}
+
+/**
+	Fusion asks for the QIcon::Active pixmap of a highlighted menu item's
+	icon too, and paints it on the highlight bar. The hover tint would
+	vanish there, so on a menu item the icon must read against the bar at
+	3:1 instead: the same ink as the item's text.
+*/
+void tst_qeticons::menuIconReadsOnHighlight()
+{
+	QFETCH(QString, theme);
+	QFETCH(QPalette, palette);
+	QIcon::setThemeName(theme);
+	QApplication::setStyle(new QETStyle(QStyleFactory::create("Fusion")));
+	QApplication::setPalette(palette);
+
+	QMenu menu;
+	QAction *action = menu.addAction(QIcon::fromTheme("zoom-fit-best"), "Zoom to fit");
+	menu.resize(160, 32);
+
+	QStyleOptionMenuItem option;
+	option.initFrom(&menu);
+	option.state |= QStyle::State_Enabled | QStyle::State_Selected;
+	option.menuItemType = QStyleOptionMenuItem::Normal;
+	option.checkType = QStyleOptionMenuItem::NotCheckable;
+	option.icon = action->icon();
+	option.text = action->text();
+	option.maxIconWidth = 22;
+	option.rect = QRect(0, 0, 160, 24);
+
+	QImage image(160, 24, QImage::Format_ARGB32_Premultiplied);
+	image.fill(palette.color(QPalette::Window));
+	QPainter painter(&image);
+	menu.style()->drawControl(QStyle::CE_MenuItem, &option, &painter, &menu);
+	painter.end();
+	QET::Test::dump(image, "menu-highlight");
+
+	// The icon column: the first maxIconWidth pixels plus Fusion's margin.
+	const QRect icon_column(0, 0, 30, 24);
+	const QColor bar(QET::Test::background(image, icon_column));
+	QCOMPARE(bar, palette.color(QPalette::Active, QPalette::Highlight));
+	const double contrast = QET::Test::inkContrast(image, icon_column);
+	QVERIFY2(contrast >= kIconRatio,
+	         qPrintable(QString("highlighted menu icon: %1").arg(contrast)));
+}
+
 /**
 	The elements panel sets a 50 px icon size so element previews are
 	large. Its project root item uses ProjectFileGP, whose theme name also
@@ -19,16 +19,25 @@
 #include <QApplication>
 #include <QCheckBox>
 #include <QComboBox>
+#include <QGraphicsItem>
+#include <QGraphicsScene>
+#include <QGraphicsView>
 #include <QHBoxLayout>
 #include <QLabel>
 #include <QLineEdit>
 #include <QMainWindow>
 #include <QPushButton>
+#include <QPainter>
 #include <QRadioButton>
+#include <QStandardItemModel>
+#include <QTreeView>
 #include <QStyleFactory>
+#include <QTabWidget>
 #include <QToolBar>

 #include "inkcontrast.h"
+#include "ElementsCollection/elementpreviewdelegate.h"
+#include "palettegraphicsview.h"
 #include "qetpalette.h"

 using QET::Palette::contrastRatio;
@@ -62,6 +71,19 @@ class tst_qetpalette : public QObject
 		void styleIsFusionMatchesObjectName();
 		void renderedWidgetsAreReadable_data();
 		void renderedWidgetsAreReadable();
+		void lineArtRuleSeparatesInkFromColor();
+		void invertedLightnessKeepsHueAndAlpha();
+		void elementPreviewReadsOnBothPalettes();
+		void previewDelegateAdaptsLineArtOnly();
+		void invertLightnessMapsSheetAndInk();
+		void invertedViewReadsOnDarkSheet();
+		void invertLightnessSpeed();
+		void gridDotColorSoftensInvertedDots();
+		void paletteViewFollowsThePalette();
+		void paletteViewKeepsSceneUpdatesFlowing();
+		void paletteViewDrawsTheRubberBand();
+		void paletteViewFollowsTheApplicationUnderAStyleSheet();
+		void paletteViewFillsWhatTheSceneLeavesBlank();

 	private:
 		static void addPaletteRows();
@@ -308,6 +330,491 @@ void tst_qetpalette::renderedWidgetsAreReadable()
 	         qPrintable(QString("line edit text: %1").arg(edit_contrast)));
 }

+namespace {
+	/// A 40 x 40 transparent picture with a 3 px stroke square in color, as
+	/// an element preview is drawn for the white sheet.
+	QImage strokeSquare(const QColor &color)
+	{
+		QImage image(40, 40, QImage::Format_ARGB32);
+		image.fill(Qt::transparent);
+		QPainter painter(&image);
+		painter.setPen(QPen(color, 3));
+		painter.drawRect(6, 6, 27, 27);
+		return image;
+	}
+
+	/// The most frequent color of a rendering: its background.
+	QRgb dominant(const QImage &image)
+	{
+		QHash<QRgb, int> histogram;
+		for (int y = 0; y < image.height(); ++y)
+			for (int x = 0; x < image.width(); ++x)
+				++histogram[image.pixel(x, y)];
+		QRgb best = 0;
+		int count = -1;
+		for (auto it = histogram.cbegin(); it != histogram.cend(); ++it)
+			if (it.value() > count) { count = it.value(); best = it.key(); }
+		return best;
+	}
+}
+
+void tst_qetpalette::lineArtRuleSeparatesInkFromColor()
+{
+	QVERIFY(QET::Palette::isLineArt(strokeSquare(Qt::black)));
+	QVERIFY(QET::Palette::isLineArt(strokeSquare(QColor(80, 80, 80))));
+	QVERIFY(!QET::Palette::isLineArt(strokeSquare(Qt::red)));
+	QVERIFY(!QET::Palette::isLineArt(strokeSquare(QColor(30, 96, 176))));
+	QVERIFY(!QET::Palette::isLineArt(QImage()));
+}
+
+/**
+	Black ink becomes the dark palette's light gray, a colored stroke keeps
+	its hue, and transparency is untouched.
+*/
+void tst_qetpalette::invertedLightnessKeepsHueAndAlpha()
+{
+	const QImage black = QET::Palette::invertedLightness(strokeSquare(Qt::black));
+	QCOMPARE(black.pixelColor(6, 20).alpha(), 255);
+	QVERIFY2(black.pixelColor(6, 20).lightnessF() > 0.8, "black ink did not become light");
+	QCOMPARE(black.pixelColor(20, 20).alpha(), 0);
+
+	const QImage red = QET::Palette::invertedLightness(strokeSquare(Qt::red));
+	const QColor stroke = red.pixelColor(6, 20);
+	QVERIFY2(qAbs(stroke.hslHueF() - QColor(Qt::red).hslHueF()) < 0.02, "hue changed");
+	QVERIFY(stroke.hslSaturationF() > 0.9);
+}
+
+/**
+	An element preview drawn for the white sheet must read at 3:1 on the
+	Base color of both palettes: unchanged on the light one, inverted on
+	the dark one.
+*/
+void tst_qetpalette::elementPreviewReadsOnBothPalettes()
+{
+	const QPixmap preview = QPixmap::fromImage(strokeSquare(Qt::black));
+	for (const QPalette &palette : {QET::Palette::fusionLight(), QET::Palette::fusionDark()})
+	{
+		const QColor base = palette.color(QPalette::Active, QPalette::Base);
+		const QPixmap shown = QET::Palette::forPalette(preview, palette);
+		QImage row(shown.size(), QImage::Format_ARGB32);
+		row.fill(base);
+		QPainter painter(&row);
+		painter.drawPixmap(0, 0, shown);
+		painter.end();
+		const double contrast = QET::Test::inkContrast(row, row.rect());
+		QVERIFY2(contrast >= 3.0, qPrintable(QString("preview reads %1:1 on Base %2").arg(contrast).arg(base.name())));
+	}
+	// A light palette hands the picture back untouched.
+	QCOMPARE(QET::Palette::forPalette(preview, QET::Palette::fusionLight()).cacheKey(), preview.cacheKey());
+}
+
+/**
+	In a tree on the dark palette, the delegate inverts a line-art icon so
+	it reads on the row, and leaves a colored icon (a folder) as it is.
+*/
+void tst_qetpalette::previewDelegateAdaptsLineArtOnly()
+{
+	QApplication::setStyle(QStyleFactory::create("Fusion"));
+	QApplication::setPalette(QET::Palette::fusionDark());
+
+	QStandardItemModel model;
+	auto *element = new QStandardItem(QIcon(QPixmap::fromImage(strokeSquare(Qt::black))), "element");
+	auto *folder = new QStandardItem(QIcon(QPixmap::fromImage(strokeSquare(QColor(30, 96, 176)))), "folder");
+	model.appendRow(element);
+	model.appendRow(folder);
+
+	QTreeView view;
+	view.setModel(&model);
+	view.setIconSize(QSize(40, 40));
+	view.setItemDelegate(new ElementPreviewDelegate(&view));
+	view.resize(300, 200);
+	view.show();
+	QVERIFY(QTest::qWaitForWindowExposed(&view));
+
+	const QImage image = view.viewport()->grab().toImage();
+	const QRect element_icon(view.visualRect(element->index()).topLeft(), QSize(40, 40));
+	const QRect folder_icon(view.visualRect(folder->index()).topLeft(), QSize(40, 40));
+	const QColor base = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Base);
+	QCOMPARE(QColor(dominant(image)), base);
+
+	const double element_contrast = QET::Test::inkContrast(image, element_icon);
+	QVERIFY2(element_contrast >= 3.0, qPrintable(QString("element preview reads %1:1 on the dark row").arg(element_contrast)));
+
+	// The folder icon keeps its blue: some pixel in its slot is still saturated blue.
+	bool blue = false;
+	for (int y = folder_icon.top(); y <= folder_icon.bottom() && !blue; ++y)
+		for (int x = folder_icon.left(); x <= folder_icon.right() && !blue; ++x)
+		{
+			const QColor c = image.pixelColor(x, y);
+			blue = c.hslSaturationF() > 0.5 && c.blue() > c.red() + 60;
+		}
+	QVERIFY2(blue, "the colored icon lost its color");
+}
+
+/**
+	The lightness inversion sends white to the sheet color and black to
+	the ink color, lands a mid gray between the two, and keeps the hue of
+	a colored line. Without sheet and ink it is a plain inversion.
+*/
+void tst_qetpalette::invertLightnessMapsSheetAndInk()
+{
+	const QColor sheet(30, 30, 30);
+	const QColor ink(220, 220, 220);
+	QImage image(4, 1, QImage::Format_ARGB32);
+	image.setPixelColor(0, 0, Qt::white);
+	image.setPixelColor(1, 0, Qt::black);
+	image.setPixelColor(2, 0, QColor(128, 128, 128));
+	image.setPixelColor(3, 0, QColor(200, 0, 0));
+	QImage plain = image;
+
+	QET::Palette::invertLightness(image, sheet, ink);
+	QCOMPARE(image.format(), QImage::Format_RGB32);
+	QCOMPARE(image.pixelColor(0, 0), sheet);
+	QCOMPARE(image.pixelColor(1, 0), ink);
+	const int middle = (sheet.red() + ink.red()) / 2;
+	QVERIFY(qAbs(image.pixelColor(2, 0).red() - middle) <= 2);
+	const QColor red = image.pixelColor(3, 0);
+	QCOMPARE(red.hslHue(), 0);
+	QVERIFY2(red.hslSaturationF() > 0.5, qPrintable(red.name()));
+	QVERIFY2(red.lightness() > QColor(200, 0, 0).lightness(), qPrintable(red.name()));
+
+	QET::Palette::invertLightness(plain);
+	QCOMPARE(plain.pixelColor(0, 0), QColor(Qt::black));
+	QCOMPARE(plain.pixelColor(1, 0), QColor(Qt::white));
+	QCOMPARE(plain.pixelColor(3, 0), QColor(255, 55, 55));
+}
+
+/**
+	A view rendered the way DiagramView does it on a dark palette: a part
+	of the viewport goes into an image, which is inverted between the
+	palette's Base and Text. The white sheet comes out as Base, black
+	lines read at text contrast, and a blue box is still blue.
+*/
+void tst_qetpalette::invertedViewReadsOnDarkSheet()
+{
+	QGraphicsScene scene(0, 0, 200, 120);
+	scene.setBackgroundBrush(Qt::white);
+	scene.addLine(10, 60, 190, 60, QPen(Qt::black, 2));
+	scene.addRect(20, 20, 40, 20, QPen(Qt::NoPen), QBrush(QColor(30, 96, 176)));
+
+	QGraphicsView view(&scene);
+	view.setFrameShape(QFrame::NoFrame);
+	view.setAlignment(Qt::AlignLeft | Qt::AlignTop);
+	view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+	view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+	view.resize(200, 120);
+	view.show();
+	QVERIFY(QTest::qWaitForWindowExposed(&view));
+
+	// A part of the viewport that is not at its origin, as a partial
+	// repaint after a scroll would be.
+	const QRect area(10, 10, 100, 60);
+	QImage buffer(area.size(), QImage::Format_RGB32);
+	QPainter painter(&buffer);
+	view.render(&painter, QRectF(QPointF(0, 0), QSizeF(area.size())), area);
+	painter.end();
+
+	const QPalette dark = QET::Palette::fusionDark();
+	const QColor base = dark.color(QPalette::Active, QPalette::Base);
+	const QColor text = dark.color(QPalette::Active, QPalette::Text);
+	QET::Palette::invertLightness(buffer, base, text);
+
+	QHash<QRgb, int> histogram;
+	for (int y = 0; y < buffer.height(); ++y)
+		for (int x = 0; x < buffer.width(); ++x)
+			++histogram[buffer.pixel(x, y)];
+	QRgb dominant = 0;
+	for (auto it = histogram.cbegin(); it != histogram.cend(); ++it)
+		if (it.value() > histogram.value(dominant)) dominant = it.key();
+	QCOMPARE(QColor(dominant), base);
+
+	const double contrast = inkContrast(buffer, buffer.rect());
+	QVERIFY2(contrast >= QET::Palette::contrastRatio(base, text) - 0.5,
+	         qPrintable(QString("ink reads %1:1 on the dark sheet").arg(contrast)));
+
+	// The box at scene (20..60, 20..40) sits at (10..50, 10..30) in the buffer.
+	const QColor box = buffer.pixelColor(30, 20);
+	QVERIFY2(box.hslSaturationF() > 0.3 && box.blue() > box.red() + 60,
+	         qPrintable(QString("the blue box became %1").arg(box.name())));
+}
+
+namespace {
+	/**
+		A PaletteGraphicsView that counts its paints and records the
+		paintingInverted() calls it receives.
+	*/
+	class ProbeView : public PaletteGraphicsView
+	{
+		public:
+			int paints = 0;
+			QList<QRect> paint_rects;
+			QList<bool> inverted_calls;
+			using PaletteGraphicsView::PaletteGraphicsView;
+			/// True when a paint since index \a from covered the whole viewport.
+			bool fullyRepaintedSince(int from) const
+			{
+				for (int i = from; i < paint_rects.size(); ++i)
+					if (paint_rects.at(i).contains(viewport()->rect()))
+						return true;
+				return false;
+			}
+		protected:
+			void paintEvent(QPaintEvent *event) override
+			{
+				++paints;
+				paint_rects << event->rect();
+				PaletteGraphicsView::paintEvent(event);
+			}
+			void paintingInverted(bool inverted) override
+			{
+				inverted_calls << inverted;
+			}
+	};
+
+	/**
+		A small folio: a white sheet with a black line and a red box.
+		Returns the box, which is selectable.
+	*/
+	QGraphicsRectItem *fillSheet(QGraphicsScene &scene)
+	{
+		scene.setSceneRect(0, 0, 200, 120);
+		scene.setBackgroundBrush(Qt::white);
+		scene.addLine(10, 60, 190, 60, QPen(Qt::black, 2));
+		QGraphicsRectItem *box = scene.addRect(20, 20, 40, 20, QPen(Qt::NoPen), QBrush(QColor(200, 0, 0)));
+		box->setFlag(QGraphicsItem::ItemIsSelectable);
+		return box;
+	}
+
+	/// The view sized to its scene, without frame or scroll bars.
+	void showAsSheet(QGraphicsView &view)
+	{
+		view.setFrameShape(QFrame::NoFrame);
+		view.setAlignment(Qt::AlignLeft | Qt::AlignTop);
+		view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+		view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+		view.resize(200, 120);
+		view.show();
+	}
+
+	/// The most frequent color of an image: the sheet.
+	QColor sheetColor(const QImage &image)
+	{
+		QHash<QRgb, int> histogram;
+		for (int y = 0; y < image.height(); ++y)
+			for (int x = 0; x < image.width(); ++x)
+				++histogram[image.pixel(x, y)];
+		QRgb best = 0;
+		for (auto it = histogram.cbegin(); it != histogram.cend(); ++it)
+			if (it.value() > histogram.value(best)) best = it.key();
+		return QColor(best);
+	}
+}
+
+/**
+	Grid dots are black, white on a black sheet, and a third of the way
+	from the sheet color to black when the sheet is about to be shown
+	inverted, so that they do not come out as bright as the ink.
+*/
+void tst_qetpalette::gridDotColorSoftensInvertedDots()
+{
+	QCOMPARE(QET::Palette::gridDotColor(Qt::white, false), QColor(Qt::black));
+	QCOMPARE(QET::Palette::gridDotColor(Qt::white, true), QColor(170, 170, 170));
+	QCOMPARE(QET::Palette::gridDotColor(Qt::darkGray, true), QColor(85, 85, 85));
+	QCOMPARE(QET::Palette::gridDotColor(Qt::black, false), QColor(Qt::white));
+	QCOMPARE(QET::Palette::gridDotColor(Qt::black, true), QColor(Qt::white));
+}
+
+/**
+	On a light palette the view shows the sheet as drawn and never tells
+	the scene it inverts. On a dark palette, set while the view is
+	showing, the sheet comes out as Base, the black line at text contrast,
+	the red box still red, and the scene hears paintingInverted(true)
+	before and (false) after. Back on a light palette the sheet is white
+	again.
+*/
+void tst_qetpalette::paletteViewFollowsThePalette()
+{
+	QApplication::setStyle(QStyleFactory::create("Fusion"));
+	QApplication::setPalette(QET::Palette::fusionLight());
+
+	QGraphicsScene scene;
+	fillSheet(scene);
+	ProbeView view(&scene);
+	showAsSheet(view);
+	QVERIFY(QTest::qWaitForWindowExposed(&view));
+
+	const QImage light = view.viewport()->grab().toImage();
+	QCOMPARE(sheetColor(light), QColor(Qt::white));
+	QVERIFY(view.inverted_calls.isEmpty());
+
+	QApplication::setPalette(QET::Palette::fusionDark());
+	QTRY_VERIFY(view.invertsLightness());
+	const QImage dark = view.viewport()->grab().toImage();
+	const QColor base = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Base);
+	const QColor text = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Text);
+	QCOMPARE(sheetColor(dark), base);
+	const double contrast = inkContrast(dark, dark.rect());
+	QVERIFY2(contrast >= QET::Palette::contrastRatio(base, text) - 0.5,
+	         qPrintable(QString("ink reads %1:1 on the dark sheet").arg(contrast)));
+	const QColor box = dark.pixelColor(40, 30);
+	QVERIFY2(box.hslHue() == 0 && box.hslSaturationF() > 0.3 && box.red() > box.blue() + 60,
+	         qPrintable(QString("the red box became %1").arg(box.name())));
+	QVERIFY(!view.inverted_calls.isEmpty());
+	QCOMPARE(view.inverted_calls.first(), true);
+	QCOMPARE(view.inverted_calls.last(), false);
+	QCOMPARE(view.inverted_calls.count(true), view.inverted_calls.count(false));
+
+	QApplication::setPalette(QET::Palette::fusionLight());
+	QTRY_VERIFY(!view.invertsLightness());
+	QCOMPARE(sheetColor(view.viewport()->grab().toImage()), QColor(Qt::white));
+}
+
+/**
+	QGraphicsView clears the scene's "update everything" flag only when it
+	paints the items straight onto its viewport, and while the flag is set
+	every further QGraphicsScene::update() and item update is dropped. On
+	a dark palette the view paints through render() instead, so it listens
+	to the scene's changed() signal, which makes the scene clear the flag
+	before it emits. Three whole-scene updates and a selection must each
+	repaint the view, with the scene set after construction as
+	DiagramView does it.
+*/
+void tst_qetpalette::paletteViewKeepsSceneUpdatesFlowing()
+{
+	QApplication::setStyle(QStyleFactory::create("Fusion"));
+	QApplication::setPalette(QET::Palette::fusionDark());
+
+	QGraphicsScene scene;
+	QGraphicsRectItem *box = fillSheet(scene);
+	ProbeView view;
+	view.setScene(&scene);
+	showAsSheet(view);
+	QVERIFY(QTest::qWaitForWindowExposed(&view));
+	QTRY_VERIFY(view.paints >= 1);
+	QVERIFY(view.invertsLightness());
+
+	for (int round = 1; round <= 3; ++round)
+	{
+		const int before = view.paints;
+		scene.update();
+		QTRY_VERIFY2(view.paints > before, qPrintable(QString("scene update %1 was dropped").arg(round)));
+	}
+
+	const int before = view.paints;
+	box->setSelected(true);
+	QTRY_VERIFY2(view.paints > before, "the selection change was dropped");
+}
+
+/**
+	render() skips Qt's selection rubber band, so the view draws it after
+	the inversion: while a drag on the sheet is in progress, the dragged
+	area no longer shows the bare sheet.
+*/
+void tst_qetpalette::paletteViewDrawsTheRubberBand()
+{
+	QApplication::setStyle(QStyleFactory::create("Fusion"));
+	QApplication::setPalette(QET::Palette::fusionDark());
+
+	QGraphicsScene scene;
+	fillSheet(scene);
+	ProbeView view(&scene);
+	view.setDragMode(QGraphicsView::RubberBandDrag);
+	showAsSheet(view);
+	QVERIFY(QTest::qWaitForWindowExposed(&view));
+	const QColor base = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Base);
+	QCOMPARE(view.viewport()->grab().toImage().pixelColor(170, 100), base);
+
+	QTest::mousePress(view.viewport(), Qt::LeftButton, Qt::NoModifier, QPoint(120, 80));
+	QTest::mouseMove(view.viewport(), QPoint(190, 115));
+	QTRY_VERIFY(!view.rubberBandRect().isNull());
+	const QColor inside = view.viewport()->grab().toImage().pixelColor(170, 100);
+	QVERIFY2(inside != base, qPrintable(QString("no rubber band drawn, pixel is %1").arg(inside.name())));
+	QTest::mouseRelease(view.viewport(), Qt::LeftButton, Qt::NoModifier, QPoint(190, 115));
+}
+
+/**
+	A style sheet on an ancestor pins the palette of every widget under it
+	to the application palette in force when the sheet was applied
+	(QStyleSheetStyle keeps its own copy; the folio tab widget carries
+	such a sheet). The view's own palette() is therefore stale after a
+	live switch, and the view must follow the application palette
+	instead: inside a tab widget with a style sheet, switching the
+	application to dark and back still changes the sheet. Qt also skips
+	the repaint of a widget whose palette did not change, so the view
+	has to repaint its whole viewport by itself on each switch, without
+	anyone asking for a rendering: otherwise the area around the sheet
+	keeps the old colors.
+*/
+void tst_qetpalette::paletteViewFollowsTheApplicationUnderAStyleSheet()
+{
+	QApplication::setStyle(QStyleFactory::create("Fusion"));
+	QApplication::setPalette(QET::Palette::fusionLight());
+
+	QGraphicsScene scene;
+	fillSheet(scene);
+	QTabWidget tabs;
+	tabs.setStyleSheet("QTabBar::scroller {width: 0px;}");   // as sources/projectview.cpp
+	auto *view = new ProbeView(&scene);
+	view->setFrameShape(QFrame::NoFrame);
+	view->setAlignment(Qt::AlignLeft | Qt::AlignTop);
+	tabs.addTab(view, "folio");
+	tabs.resize(320, 240);
+	tabs.show();
+	QVERIFY(QTest::qWaitForWindowExposed(&tabs));
+	QCOMPARE(sheetColor(view->viewport()->grab().toImage()), QColor(Qt::white));
+
+	int since = view->paint_rects.size();
+	QApplication::setPalette(QET::Palette::fusionDark());
+	QTRY_VERIFY(view->invertsLightness());
+	QTRY_VERIFY2(view->fullyRepaintedSince(since), "no full repaint after the switch to dark");
+	const QColor base = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Base);
+	QCOMPARE(sheetColor(view->viewport()->grab().toImage()), base);
+
+	since = view->paint_rects.size();
+	QApplication::setPalette(QET::Palette::fusionLight());
+	QTRY_VERIFY(!view->invertsLightness());
+	QTRY_VERIFY2(view->fullyRepaintedSince(since), "no full repaint after the switch to light");
+	QCOMPARE(sheetColor(view->viewport()->grab().toImage()), QColor(Qt::white));
+}
+
+/**
+	render() paints only what the scene draws. A scene without a
+	background brush leaves the rest of the buffer untouched, so the view
+	fills it first: on the dark palette the blank area comes out as Base,
+	not as whatever the memory held.
+*/
+void tst_qetpalette::paletteViewFillsWhatTheSceneLeavesBlank()
+{
+	QApplication::setStyle(QStyleFactory::create("Fusion"));
+	QApplication::setPalette(QET::Palette::fusionDark());
+
+	QGraphicsScene scene(0, 0, 200, 120);
+	scene.addLine(10, 60, 190, 60, QPen(Qt::black, 2));
+	ProbeView view(&scene);
+	showAsSheet(view);
+	QVERIFY(QTest::qWaitForWindowExposed(&view));
+
+	const QImage image = view.viewport()->grab().toImage();
+	const QColor base = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Base);
+	QCOMPARE(sheetColor(image), base);
+	QCOMPARE(image.pixelColor(100, 20), base);
+	QCOMPARE(image.pixelColor(100, 100), base);
+}
+
+/**
+	The inversion runs on every repaint of the folio, so a 4K viewport
+	has to cost a few milliseconds. Reported, not asserted: the bound
+	depends on the build box.
+*/
+void tst_qetpalette::invertLightnessSpeed()
+{
+	QImage image(3840, 2000, QImage::Format_RGB32);
+	image.fill(Qt::white);
+	QBENCHMARK {
+		QET::Palette::invertLightness(image, QColor(30, 30, 30), QColor(220, 220, 220));
+	}
+}
+
 int main(int argc, char **argv)
 {
 	// Widgets are painted for real, on Qt's offscreen platform so the test