https://bugs.kde.org/show_bug.cgi?id=500620
Bug ID: 500620
Summary: Cursor sometimes jumps to the left when hovering
auto-hidden task bar from top and bottom docked window
Classification: Plasma
Product: plasmashell
Version: 6.2.5
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Panel
Assignee: plasma-b...@kde.org
Reporter: flor...@nuecke.de
CC: niccolo.venera...@gmail.com
Target Milestone: 1.0
Created attachment 178770
--> https://bugs.kde.org/attachment.cgi?id=178770&action=edit
Video of cursor jumping when hovering taskbar with 0 padding, note mouse is
only ever moved vertically.
SUMMARY
I've noticed my mouse cursor suddenly being displaced to the left occasionally
when hovering the task bar, which is quite annoying. However, this did not
happen always, so it took a while to narrow it down. I've now found a way to
reproduce this relatively reliably -- still can take a couple of attempts to
trigger the effect; not sure if this is based on timing or some specific cursor
positioning/movement.
STEPS TO REPRODUCE
1. Configure taskbar to: position = bottom, alignment = center, width = fill
width, visibility = auto hide (!), opacity = opaque, style = floating. I have
not tested all permutations, but I'm pretty sure only bottom and especially
auto hide matters here, and I checked and at least style does not matter (also
happens when not floating).
2. Dock any window to at least the bottom and top edge of the screen with zero
padding. So either drag the top and bottom window edges to the top and bottom
of the screen, or use tiling areas with padding of the tiling zones set to
zero. Note that this does *not* happen when using tiling zones and padding is
non-zero. Note this also does *not* happen if window is only docked to bottom
of screen.
3. Move mouse cursor vertically from window to task bar / very bottom of screen
to trigger task bar becoming visible, if necessary repeatedly until mouse jump
to the left is observed. Gut feeling happens 2/10 times on average.
OBSERVED RESULT
Mouse cursor sometimes repositions to the left (still at bottom edge of screen)
even if mouse is only moved vertically/up and down.
EXPECTED RESULT
Mouse cursor does not reposition to the left if mouse is only moved up and
down, but only moves according to actual mouse movement.
SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.12.12-2-MANJARO (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION
The attached video showcases how this does not happen when padding for tiling
zones is non-zero, then the padding is reconfigured to zero and the effect is
demonstrated (and also that it can take a few attempts to get it to trigger).
For brevity there is a limited number of demonstrations for the non-zero
padding case. I've tried *a lot* and it didn't trigger in the non-zero case
even after several dozen attempts.
I'm not entirely sure which component this relates to specifically, so I'm
hoping this can be moved if necessary.
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