https://bugs.kde.org/show_bug.cgi?id=473047
Bug ID: 473047
Summary: Tablet protocol implementation not always generating a
proximity_in event when near opengl* window
Classification: Plasma
Product: plasma-wayland-protocols
Version: 1.10.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: ianwoodfor...@gmail.com
CC: aleix...@kde.org
Target Milestone: ---
SUMMARY
If a pen comes close to the screen on an opengl* window, and is then hovered
onto a new window, no "proximity_in" event is generated for that new window.
STEPS TO REPRODUCE
1. Clone `https://github.com/0x182d4454fb211940/winit.git`
2. Switch to `proximity-test` branch. (Alternatively, use something that can
directly print the tablet events. This is just a stripped-down version of where
I noticed the bug.)
3. Run `cargo run --example proximity_test`
4. Bring the pen close to the screen, such that the pointer is inside the
window that just opened. Take the pen away from the screen.
5. Bring the pen close to the screen, such that the pointer is inside an
opengl* window. Move the pen onto the window spawned by cargo (so the pointer
jumps directly from the opengl window to the new window), without touching the
screen, and while maintaining pointer hover. Take the pen away.
6. Observe the output.
OBSERVED RESULT
proximity event: ProximityIn { /* snip */ }
proximity event: ProximityOut
proximity event: ProximityOut
EXPECTED RESULT
proximity event: ProximityIn { /* snip */ }
proximity event: ProximityOut
proximity event: ProximityIn { /* snip */ }
proximity event: ProximityOut
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.4.7-arch1-3 (64-bit)
(available in About System)
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.108.0
Qt Version: 5.15.10
ADDITIONAL INFORMATION
My implementation here is very rough and could somehow be the source of the
error. However gnome exhibits what I expect to be the correct behaviour.
* OpenGL is my guess. I originally noticed this with kitty, which I believe
uses opengl, and I tried with glxgears and that also reproduced the bug. Moving
the pen pointer from firefox or the desktop correctly produced proximity_in
events.
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