[kde] [Bug 489657] New: Certain fractional scaling levels cause mouse to stick at screen edge

[Sam]

https://bugs.kde.org/show_bug.cgi?id=489657

            Bug ID: 489657
           Summary: Certain fractional scaling levels cause mouse to stick
                    at screen edge
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: samuel.collins at live.co.uk
  Target Milestone: ---

SUMMARY
I have a 2-monitor setup (left|right, with left as primary, both monitors
1440p) and I use a 115% fractional scaling level on both monitors (Wayland).
This causes the cursor to "stick" (behaves like the new "edge barrier" feature)
to the right edge of the left screen when trying to move onto my right monitor.

This only happens in that direction (right->left is not sticky at all unless
edge barrier is switched on, but that makes the left->right direction even
stickier). This doesn't happen at 100%, 200%, or 125% scale, but does seem to
happen at 110% and 120%, and a number of other scaling factors that aren't a
multiple of 25 (though not all). This was also happening prior to plasma 6.1
(before the edge barrier feature was introduced).

I also tested at 1080p, and whilst I don't see the same behaviour at 115%, I do
at 110%, though it is a little less noticeable.


STEPS TO REPRODUCE
1. Configure 2 monitors side-by-side, left primary, with one of the problematic
resolution/scaling combinations (e.g. 1440p/115% or 1080p/110%) in display
configuration (system settings)
2. Switch off edge barrier in screen edges (system settings)
3. Move mouse slowly from left screen onto right

OBSERVED RESULT
Mouse cursor gets stuck at screen border

EXPECTED RESULT
Mouse cursor moves freely onto right screen

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  Arch Linux with Plasma 6.1.1

KDE Plasma Version: 6.1.1
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
Graphics Platform: Wayland

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