Open the text orientation dialog at the texts' current angle

The "Orienter les textes" dialog always opened at 0, so turning a text
at 90 degrees by a little meant typing the angle in again. It now opens
at the angle every selected text and text group shares, and at 0 as
before when they differ.

The shortcut bar showed only a command's short name as its tooltip,
which for this one ("Choose texts orientation") does not say what it
does. It now adds the command's status tip on a second line: "Rotate
selected texts to a specific angle".

Checked in the GUI on a folio holding one text at 90 degrees: master
opens the dialog at 0.00, this at 90.00.

Fixes #1082

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

sources/diagramcontexttoolbar.cpp

@@ -23,6 +23,7 @@
 #include <QHBoxLayout>
 #include <QMouseEvent>
 #include <QSettings>
+#include <QStringBuilder>
 #include <QToolButton>
 
 namespace {
@@ -92,7 +93,11 @@ void DiagramContextToolbar::showAt(const QPoint &viewport_pos,
 		} else {
 			button->setIcon(action->icon());
 		}
-		button->setToolTip(text);
+			//The status tip says what the command does, which a short
+			//name such as "Orienter les textes" does not
+		button->setToolTip(action->statusTip().isEmpty()
+				   ? text
+				   : text % QLatin1Char('\n') % action->statusTip());
 		button->setEnabled(action->isEnabled());
 		connect(button, &QToolButton::clicked, action, &QAction::trigger);
 		m_layout->addWidget(button);

sources/qetdiagrameditor.cpp

@@ -2059,7 +2059,7 @@ void QETDiagramEditor::selectionGroupTriggered(QAction *action)
 			//nothing to rotate.
 		if (RotateTextsCommand::hasSelectedTexts(diagram))
 		{
-			qreal rotation = 0;
+			qreal rotation = RotateTextsCommand::currentRotation(diagram);
 			if (RotateTextsCommand::askRotation(rotation))
 				diagram->undoStack().push(new RotateTextsCommand(diagram, rotation));
 		}

sources/undocommand/rotatetextscommand.cpp

@@ -25,6 +25,8 @@
 #include "../qetgraphicsitem/elementtextitemgroup.h"
 #include "../qtextorientationspinboxwidget.h"
 
+#include <cmath>
+
 /**
 	@brief RotateTextsCommand::hasSelectedTexts
 	@param diagram
@@ -41,6 +43,35 @@ bool RotateTextsCommand::hasSelectedTexts(Diagram *diagram)
 	return (!dc.selectedTexts().isEmpty() || !dc.selectedTextsGroup().isEmpty());
 }
 
+/**
+	@brief RotateTextsCommand::currentRotation
+	@param diagram
+	@return the rotation shared by every selected text and text group of
+	@p diagram, so the dialog can open at the angle they already have.
+	0 when nothing is selected or when their angles differ.
+*/
+qreal RotateTextsCommand::currentRotation(Diagram *diagram)
+{
+	if(!diagram)
+		return 0;
+
+	DiagramContent dc(diagram);
+	QList<qreal> angles;
+	for(DiagramTextItem *dti : dc.selectedTexts())
+		angles << dti->rotation();
+	for(ElementTextItemGroup *etig : dc.selectedTextsGroup())
+		angles << etig->rotation();
+
+	if(angles.isEmpty())
+		return 0;
+	for(qreal angle : angles)
+		if(qAbs(angle - angles.first()) > 0.01)
+			return 0;
+
+		//The dialog's spin box accepts -360 to 360
+	return std::fmod(angles.first(), 360);
+}
+
 /**
 	@brief RotateTextsCommand::RotateTextsCommand
 	@param diagram : Apply the rotation to the selected texts and group of texts
@@ -124,8 +155,8 @@ void RotateTextsCommand::redo()
 /**
 	@brief RotateTextsCommand::askRotation
 	Ask the user for an orientation.
-	@param rotation : set to the chosen angle when the dialog is accepted,
-	left untouched otherwise.
+	@param rotation : the angle the dialog opens at; set to the chosen
+	angle when the dialog is accepted, left untouched otherwise.
 	@return true if the user accepted, false if they cancelled.
 
 	Deliberately static and separate from the command: a QUndoCommand that
@@ -145,6 +176,7 @@ bool RotateTextsCommand::askRotation(qreal &rotation)
 	
 	QTextOrientationSpinBoxWidget *ori_widget = QETApp::createTextOrientationSpinBoxWidget();
 	ori_widget->setParent(&ori_text_dialog);
+	ori_widget->setOrientation(rotation);
 	ori_widget->spinBox()->selectAll();
 	
 	QDialogButtonBox buttons(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);

sources/undocommand/rotatetextscommand.h

@@ -40,7 +40,7 @@ class QParallelAnimationGroup;
 	Typical interactive use:
 	@code
 	if (RotateTextsCommand::hasSelectedTexts(diagram)) {
-		qreal rotation = 0;
+		qreal rotation = RotateTextsCommand::currentRotation(diagram);
 		if (RotateTextsCommand::askRotation(rotation))
 			diagram->undoStack().push(new RotateTextsCommand(diagram, rotation));
 	}
@@ -53,7 +53,9 @@ class RotateTextsCommand : public QUndoCommand
 
 			/// @return true if @p diagram has at least one selected text or text group to rotate.
 		static bool hasSelectedTexts(Diagram *diagram);
-			/// Open the orientation dialog. @return true and set @p rotation if accepted, false if cancelled.
+			/// @return the angle the selected texts share, or 0 if they differ.
+		static qreal currentRotation(Diagram *diagram);
+			/// Open the orientation dialog at @p rotation. @return true and set @p rotation if accepted, false if cancelled.
 		static bool askRotation(qreal &rotation);
 
 		void undo() override;