#1533 stopped the panel shrinking to its title bar when the selection
had nothing to edit, so that it would keep the height the user gave it
(#1439). Users want the room back for the Collections and Auto numbering
panels while nothing is selected (#1566).
The panel's layout is back to QLayout::SetMaximumSize, so the empty
panel shrinks as before. Just before its last editor goes, the panel
keeps the heights of every docked panel in its area; when an editor
comes back it gives them back with QMainWindow::resizeDocks, the call a
separator drag makes. Giving only this panel its height back fell 35 px
short in the test: the neighbours had been split again from their size
hints and gave up only part of the room.
Test: tst_selectionpanelheight now checks, twice over, that the empty
panel shrinks and that selecting an element again brings back the height
the user gave it. Without the restore the panel comes back at 470 px
instead of 560; on master the empty panel does not shrink.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The panel shrank to its title bar whenever the selection had nothing it
could edit (a click on an empty spot, several elements, a mix of items):
its content layout used QLayout::SetMaximumSize, and an empty vertical
layout's maximum height is 0. The other right-hand panels took the room,
and when an element was selected again the panels were split again from
their size hints, so the height the user had dragged the panel to was
lost (reported by ankostis in #1439).
With the default size constraint the panel keeps its height and stays
blank while there is nothing to edit. The element, wire, text and shape
editors draw the same: their screenshots in a 730-860 px tall panel are
pixel-identical before and after.
Test: tst_selectionpanelheight (on master the height goes from 560 to
19 px).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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