Bug ID: 417669
           Summary: Wayland cursor position sent incorrectly to Xwayland
           Product: Breeze
           Version: 5.18.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: gtk theme
  Target Milestone: ---

Created attachment 126040
screenshot of issue. Red dot is drawn at cursor position.


This would be very easy to demonstrate with a screen recorder, unfortunately I
cannot find anything that can record the screen on kde wayland.

1. Open firefox or thunderbird in plasma wayland
2. Try to click on something
3. Both firefox and thunderbird think the mouse cursor is about -10px x -10px
out of position

Demo screnshot attached. I have created a test page here: so you can see what it supposed to
happen. It draws a red dot at the cursor position. As you can see in my
screenshot, Firefox thinks the cursor is in a different place than it is.

I had thought this affected all GTK apps but testing in GIMP, the pencil draws
at exactly the correct position.

Additional information:

I am running a 120 font DPI which scales the UI. Perhaps it's something to do
with this scaling which causes the miscalculation.


Linux/KDE Plasma: 5.18.0
(available in About System)
KDE Plasma Version:  5.18.0

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