[kmail2] [Bug 402241] New: KMail Wayland UI drawing flakiness

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https://bugs.kde.org/show_bug.cgi?id=402241

            Bug ID: 402241
           Summary: KMail Wayland UI drawing flakiness
           Product: kmail2
           Version: Git (master)
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: groot at kde.org
  Target Milestone: ---

SUMMARY
KMail interacts very strangely with other applications under Wayland, and seems
to "fight" with others about drawing on the visible screen.

STEPS TO REPRODUCE
1. Install KDE neon git-unstable, start a Wayland session.
2. Start KMail. Have a KMail main window on the screen.
3. Start Spectacle.

OBSERVED RESULT
When mousing over the spectacle window, sometimes the KMail window is repainted
over the spectacle window. Then when mousing over input elements in Spectacle
(e.g. dropdowns) those are re-painted on-top of the bits of KMail.

Same happens with Quassel client, but also KMail message composer windows which
will be obscured by the painting of the main window (behind).

EXPECTED RESULT
That KMail on Wayland behaves like on X11: the main window isn't painted
overtop of other, active, windows.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE neon git unstable
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 5.54
Qt Version: 

ADDITIONAL INFORMATION
Screenshots are kind of hard to make of this; I suppose I could do a movie with
an external camera. I've only tested this on a Slimbook, i.e. Intel graphics.

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