https://bugs.kde.org/show_bug.cgi?id=439792

            Bug ID: 439792
           Summary: Background wallpaper flashes for a moment when window
                    enters or leaves Full screen
           Product: kwin
           Version: 5.22.3
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: effects-various
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 140017
  --> https://bugs.kde.org/attachment.cgi?id=140017&action=edit
The file contains a video of konsole entering and leaving full screen

SUMMARY
Background flashing for a moment when window enters or leaves fullscreen. It is
always observed in Firefox and Konsole. In other applications it is observed
most of the time.
NOTE:
 This happens even when translucent effect is disabled

STEPS TO REPRODUCE
1. Make sure both Full Screen and Maximize animations are turned on in Desktop
effects.Use Breeze light theme to observe this easily.
2. Open any application. Make sure all other applications are minimized.
3. Maximize window and leave Full screen(simply press maximize button again).Do
this repeatedly.

OBSERVED RESULT
Background comes into view for a moment when window enters or leaves Full
screen as if the window is translucent.

EXPECTED RESULT
Only the application window should be in view while entering or leaving Full
screen. Any other apps or wallpaper in background should not flash.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: KDE Neon 5.22
(available in About System)
KDE Plasma Version: 5.22.3
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION

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