https://bugs.kde.org/show_bug.cgi?id=445457
Bug ID: 445457
Summary: Showing a window before disabling resizing (GTK4
dialogs) results in incorrect title bar buttons
Product: kwin
Version: 5.23.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: decorations
Assignee: kwin-bugs-n...@kde.org
Reporter: nyanpas...@tuta.io
Target Milestone: ---
Created attachment 143527
--> https://bugs.kde.org/attachment.cgi?id=143527&action=edit
The bug in gtk4-demo
SUMMARY
In X11 apps which first map a window, *then* call XSetWMNormalHints or send
WM_NORMAL_HINTS to disable resizing (which hides kwin_x11's Maximize button),
KWin fails to recompute the title bar layout and right-align the buttons.
STEPS TO REPRODUCE
1. Run gtk4-demo.
2. Scroll down to Dialogs and click Run.
OBSERVED RESULT
The title bar contains a minimize button, close button, and a blank space to
the right (where the close button would be, if a maximize button was present).
EXPECTED RESULT
The title bar is properly right-aligned.
I don't know if GTK4 is wrong for mapping a window before disabling resize, or
if KWin is wrong for rendering the title bar incorrectly when resizability is
toggled after a window is mapped, or both.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
Kernel Version: 5.14.16-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: NVIDIA GeForce GT 730/PCIe/SSE2
ADDITIONAL INFORMATION
First reported in https://bugs.kde.org/show_bug.cgi?id=439137#c1. I
investigated the root cause at
https://gitlab.gnome.org/GNOME/gtk/-/issues/4090#note_1309466. I decided to
split it out since it's a different issue.
This happens by default in GTK4 dialogs, but I was also able to reproduce this
effect in a Qt app by calling
`dialog->layout()->setSizeConstraint(QLayout::SetFixedSize)` (which disables
resizing) after the dialog is shown.
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