https://bugs.kde.org/show_bug.cgi?id=466311

            Bug ID: 466311
           Summary: Multi-monitor size is calculated incorrectly with
                    fractional scaling on plasma-wayland resulting in
                    display overlaps
    Classification: Plasma
           Product: plasmashell
           Version: 5.27.1
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Multi-screen support
          Assignee: plasma-b...@kde.org
          Reporter: adr...@nievergelt-merz.ch
                CC: aleix...@kde.org, notm...@gmail.com
  Target Milestone: 1.0

SUMMARY


STEPS TO REPRODUCE
1. Set primary monitor, (3840x2160) to 130% scaling.
2. Set secondary monitor (3840x2160) to 100% scaling to the right of primary.
3. Log out and log back in.

OBSERVED RESULT
There's a n overlap of a few pixels on the secondary monitor from the primary
background which can be switched opposite by clicking on the secondary monitor
background. Second monitor is docked at (2952,211). Launcher menu will open on
the secondary screen.

EXPECTED RESULT
Monitors well separated and secondary position calculated correctly. The
secondary monitor should probably be placed at (round(3840/1.3)=2954,
round(2160/1.3)-1440 = 222). Launcher should open above launcher icon in the
left-bottom screen of primary monitor.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Gentoo linux with plasma-wayland
KDE Plasma Version: 5.27.1 
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8-r3

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