https://bugs.kde.org/show_bug.cgi?id=438326
Bug ID: 438326
Summary: Using KWin for wayland, GTK scroll events report wrong
scroll distance.
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: emi...@crisal.io
Target Milestone: ---
Created attachment 139141
--> https://bugs.kde.org/attachment.cgi?id=139141&action=edit
Sample python application that shows the issue.
SUMMARY
Using a mousewheel on Plasma 5 (under Wayland), gtk applications receive scroll
events with odd deltas.
On Gnome 40 or Plasma on X11, a single wheel tick reports a
GdkScrollEvent.delta_y value of 1, while on plasma it reports 1.5. This causes
GTK apps to scroll faster than usual.
STEPS TO REPRODUCE
1. Run the application attached in Plasma with wayland
2. Use the mousewheel
OBSERVED RESULT
Note the scroll deltas:
> scroll 0.0 1.5
EXPECTED RESULT
> Scroll 0.0 1.0
SOFTWARE/OS VERSIONS
Operating System: Fedora 34
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.2
Kernel Version: 5.12.9-300.fc34.x86_64
OS Type: 64-bit
Graphics Platform: Wayland
ADDITIONAL INFORMATION
I found this when trying to make Firefox scroll a bit faster:
https://bugzilla.mozilla.org/show_bug.cgi?id=1715513
The patch there causes Gnome to work great, but on Plasma+Wayland the scroll
speed is too high because of this bug.
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