https://bugs.kde.org/show_bug.cgi?id=489983
Bug ID: 489983
Summary: Incorrect window size when restoring from a maximized
state
Classification: Plasma
Product: kwin
Version: 6.1.1
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: frank.praz...@gmail.com
Target Milestone: ---
Created attachment 171504
--> https://bugs.kde.org/attachment.cgi?id=171504&action=edit
WAYLAND_DEBUG=1 output
Upstream SDL bug: https://github.com/libsdl-org/SDL/issues/10203
Windows will shrink in size by few pixels after being maximized and restored.
In some cases this can allow the window to have zero area, causing a crash.
STEPS TO REPRODUCE
1. Build the main branch of SDL3 with the tests enabled (cmake -DSDL_TESTS=on)
2. Run testsprite with the --resizable flag
3. Click the maximize button in the title bar, followed by the restore button
OBSERVED RESULT
The 640x480 window becomes 637x478
EXPECTED RESULT
The 640x480 window remains 640x480
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 40 with KDE 6.1.1
ADDITIONAL INFORMATION
The WAYLAND_DEBUG=1 output shows the following when restoring from maximized:
1. KWin sends a configure event for the floating window with a size of 643x482
(???)
2. The SDL application ignores the size hint in this case, because it knows
that the floating window size should be 640x480
3. The window is configured to be 640x480 and a buffer of that size is attached
4. KWin then sends a 'corrected' configure event with current dimensions offset
by -3,-2, in what appears to be an attempt to fix the previously requested
(incorrect) window size, but that ends up making the window 637x478, since the
geometry was already corrected by SDL.
The window size sent in the configure event for floating windows is just a
hint, so I don't think that SDL is in the wrong here by ignoring it in favor of
what it knows to be correct, which it has historically had to do since some
older compositors would send incorrectly resize the window when transitioning
from non-floating to floating states.
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