https://bugs.kde.org/show_bug.cgi?id=448856
Bug ID: 448856
Summary: [Wayland] Window is positioned at 0,0 when
Fullscreen->Windowed transition occurs
Product: kwin
Version: 5.23.4
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: flibitijib...@flibitijibibo.com
Target Milestone: ---
SUMMARY
When a Wayland window starts in fullscreen, then transitions to windowed mode,
there is a risk that the window will be anchored to (0,0). For the default
Plasma layout this is normally fine, but if for whatever reason the user has
the taskbar at the top rather than the bottom, the decorations will be hidden
behind the taskbar and therefore be inaccessible. We believe this is caused by
the fact that it _starts_ in fullscreen mode, and so it technically makes sense
that the first and only known position is at the very top left corner. If the
application starts in windowed mode this does not occur.
STEPS TO REPRODUCE
This can be reproduced with SDL and a small test program, found here. From a
Fedora installation with the taskbar at the top of the display...
1. dnf install SDL2-devel (or build/install SDL from source, latest Git does
have some fixes for libdecor!)
2. Download/Build titlebar.c, linked above (see instructions at the top of the
file)
3. SDL_VIDEODRIVER=wayland ./titlebar
4. Press the space bar
OBSERVED RESULT
The window is at the top left of the screen, making the title bar inaccessible
EXPECTED RESULT
The window is either at the top left of the usable desktop space, or somewhere
else that's accessible (i.e. the center of the display).
SOFTWARE/OS VERSIONS
* plasma-desktop 5.23.4-1.fc35.x86_64
* Kernel 5.15.14-200.fc35.x86_64
* Both Mesa 21.3.4 and NVIDIA 495.46
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