https://bugs.kde.org/show_bug.cgi?id=452938
Bug ID: 452938
Summary: pointer confinement regions misapplied to libdecor
decorations
Product: kwin
Version: 5.24.4
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: da...@ingeniumdigital.com
Target Milestone: ---
SUMMARY
If an application uses client side decorations as implemented by libdecor[1],
when it sets a pointer confinement region using
zwp_pointer_constraints_v1_confine_pointer() on the content surface, that
region includes the titlebar, not just the content surface. (i.e., location
(0,0) is the top-left of the parent surface, not the child surface).
This means that the pointer can escape into the titlebar (which was not
intended), and the bottom, titlebar-sized area of the window is inaccessible.
Weston shows the expected behaviour.
Note that libdecor does not use client-side decorations when SSDs are
available: the recently-added LIBDECOR_FORCE_CSD=1 environment variable should
be used, and hence a recent git version of libdecor.
STEPS TO REPRODUCE
1. Get the latest git versions of SDL and libdecor, and build them (and their
tests).
2. Set the following environment variables: SDL_VIDEODRIVER=wayland
SDL_VIDEO_WAYLAND_PREFER_LIBDECOR=1 LIBDECOR_FORCE_CSD=1
3. Run a program which confines the mouse cursor. For example: ./test/testgl2
--confine-cursor 0,0,640,480
OBSERVED RESULT
The pointer is confined to a 640×480 region which includes the titlebar, but
not the bottom of the content area.
EXPECTED RESULT
The pointer is confined to the 640×480-sized content area, but cannot escape
into the titlebar. The bottom few pixels of the content area are accessible.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
See also bug #449620, which seems related.
I've also seen this occur on the Tomb Raider (2013) game.
[1]: https://gitlab.gnome.org/jadahl/libdecor
[2]: https://github.com/libsdl-org/SDL
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