https://bugs.kde.org/show_bug.cgi?id=499576
Bug ID: 499576
Summary: [Wayland] zwp_tablet_tool_v2.proximity_in() event is
sent with the parent surface, not the subsurface where
the event actually occurred
Classification: Plasma
Product: kwin
Version: 6.2.5
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: acct...@mail.rvvm.ing
Target Milestone: ---
SUMMARY
My project uses subsurfaces attached to the layer-shell overlay
(wlr-layer-shell protocol) with an empty input region. When the tablet tool's
cursor enters that subsurface, zwp_tablet_tool_v2.proximity_in() is sent with
the parent wl_surface (which, in this case, is the overlay with the empty input
region). The protocol description for tablet_v2 doesn't mention how focus works
with subsurfaces, but since it's a pointer-like device, I expect the same
behavior as with wl_pointer
STEPS TO REPRODUCE
1. Create a layer-shell overlay (e.g., wl_surface object ID 21) and attach
subsurface (e.g., wl_surface object ID #300).
2. Move the tablet tool's cursor over the subsurface.
3. Check the console output while running with WAYLAND_DEBUG=1 or log the
pointer of the received wl_surface.
OBSERVED RESULT
[1869288.535] {Default Queue} zwp_tablet_tool_v2#4278190081.proximity_in(42833,
zwp_tablet_v2#4278190080, wl_surface#21)
EXPECTED RESULT
zwp_tablet_tool_v2.proximity_in with wl_surface#300
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.12.10-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 9 5900HX with Radeon Graphics
Memory: 31.2 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3080 Laptop GPU/PCIe/SSE2
ADDITIONAL INFORMATION
Project that can be used to demonstrate the issue:
https://github.com/CluelessCatBurger/wl_shimeji
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