Bug 496213

Summary: After 3-finger swiping on the touchscreen to switch virtual desktop, window cannot be dragged by touchscreen but only by cursor or touchpad
Product: [Plasma] kwin Reporter: postix <postix>
Component: effects-overviewAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED FIXED    
Severity: normal    
Priority: NOR    
Version First Reported In: 6.2.3   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: https://invent.kde.org/plasma/kwin/-/commit/1649cbb8df6045959d673ae9240fbdc46efdbf75 Version Fixed/Implemented In:
Sentry Crash Report:

Description postix 2024-11-13 12:20:54 UTC 
STEPS TO REPRODUCE
1. Laptop with a built in touchscreen.
2. Open the overview effect
3. Do a 3-finger swipe to switch the virtual desktop
4. Try to drag a window to move it onto a different virtual desktop

OBSERVED RESULT

Dragging does work with the touchpad, but it does not work with the touchscreen!
There's no relevant debug log in journalctl or dmesg.

This issue does not appear when the VDs are switched with the touchpad or hotkeys in beforehand.

EXPECTED RESULT

Dragging also works with the touchscreen.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 41
KDE Plasma Version: 6.2.3
KDE Frameworks Version: 6.8.0
Qt Version: 6.8.0
Kernel Version: 6.11.7-300.fc41.x86_64 (64-bit)
Graphics Platform: Wayland
Comment 1 postix 2024-11-13 12:22:00 UTC 
3. Do a 3-finger swipe ON THE TOUCHSCREEN to switch the virtual desktop
Comment 2 Bug Janitor Service 2024-11-13 16:13:16 UTC 
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/6766
Comment 3 Zamundaaa 2024-11-14 17:54:05 UTC 
Git commit 1649cbb8df6045959d673ae9240fbdc46efdbf75 by Xaver Hugl.
Committed on 14/11/2024 at 17:38.
Pushed by zamundaaa into branch 'master'.

effect: plumb through touch cancel events and forward them to qtquick

M  +4    -0    src/effect/effect.cpp
M  +5    -0    src/effect/effect.h
M  +7    -0    src/effect/effecthandler.cpp
M  +1    -0    src/effect/effecthandler.h
M  +10   -0    src/effect/offscreenquickview.cpp
M  +1    -0    src/effect/offscreenquickview.h
M  +7    -0    src/effect/quickeffect.cpp
M  +1    -0    src/effect/quickeffect.h
M  +5    -0    src/input.cpp

https://invent.kde.org/plasma/kwin/-/commit/1649cbb8df6045959d673ae9240fbdc46efdbf75