https://bugs.kde.org/show_bug.cgi?id=471132
Bug ID: 471132
Summary: _NET_FRAME_EXTENTS returns incorrect output on
XWAYLAND
Classification: Plasma
Product: kwin
Version: 5.27.4
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: dofficialg...@gmail.com
Target Milestone: ---
SUMMARY
When using XWAYLAND to draw windows, we can use xwininfo and xprop to get
output from the currently drawn window. The values returned for
_NET_FRAME_EXTENTS are incorrect when using any scaling factor (fractional and
whole). The values returned should be the size of the window borders at the
current scaling factor. For example, if the top border is 29pixels at 100%,
then at 200% we would expect this value to be 58pixels from
_NET_FRAME_EXTENTS. However the value reported is still 29pixels.
STEPS TO REPRODUCE
1. spawn a window in xwayland with some scaling factor used (example of a YAD
window spawned in the top left: ex: `GDK_BACKEND=x11 yad
--geometry=200x200+0+0`)
2. check the winows output from xwininfo and note the "Absolute upper-left Y:"
`xwininfo`
3. compare to the output from xprop `xprop _NET_FRAME_EXTENTS -id
window_id_from_xwininfo`
OBSERVED RESULT
the observed result is that the output from xwininfo is correct with the
"Absolute upper-left Y:" equaling the scaled window border size while the
output from _NET_FRAME_EXTENTS is the window border size without any scaling.
This is not the case on GNOME or native XORG with scaling
EXPECTED RESULT
the output from xwininfo and _NET_FRAME_EXTENTS match
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu Lunar 5.27.4
(available in About System)
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
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