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I20260515-1811

I20260515-1811: [Gtk4] Fix PaintListener paint ordering for all widget types
@akurtakov akurtakov tagged this 15 May 14:29 
On Gtk 4, PaintListener on leaf controls (Button, Label, etc.) drew
custom content under the native widget appearance instead of over it
(issue #2819). Fixing this by simply moving snapshotToDraw after the
children loop regressed JFace Forms rendering (PR #3299).

New paint-ordering scheme that mirrors Gtk 3's
signal split (EXPOSE_EVENT_INVERSE for containers, DRAW/EXPOSE_EVENT
for leaf controls).
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