[kde] [Bug 438761] New: Window un-grey-out animation after closing popup systematically flickers

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https://bugs.kde.org/show_bug.cgi?id=438761

            Bug ID: 438761
           Summary: Window un-grey-out animation after closing popup
                    systematically flickers
           Product: kde
           Version: unspecified
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: php4fan at gmail.com
  Target Milestone: ---

SUMMARY


STEPS TO REPRODUCE
1. In Kate, open a file, edit it, and then close it without saving
2. a popup shows up asking whether or not to exit without saving
3. Hit Cancel

You can observe the issue with any other application, by performing any action
that causes a popup to show up, and then closing the popup with any action that
does not close the main application (doesn't have to be cancel: in another
context selecting ok may close the popup and do whatever you have confirmed to
do without closing the application).

OBSERVED RESULT

When the popup shows up on top of the application window, the application
window becomes greyed out. When you close the popup, the window gets un-greyed
out with a short animation, but it flickers: it does the full animation where
it goes from dark to bright, then it goes full dark for one frame and bright
again immediately. It's very annoying and it gives the impression that
something is broken (well, actually it is)

EXPECTED RESULT

Should do the animation smoothly

Operating System: openSUSE Tumbleweed 20210612
KDE Plasma Version: 5.22.0
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.2
Kernel Version: 5.12.9-1-default (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-1065G7 CPU @ 1.30GHz
Memory: 7.3 GiB of RAM
Graphics Processor: Mesa DRI Intel® Iris® Plus Graphics

ADDITIONAL INFORMATION

This has appeared recently in OpenSUSE Tumbleweed.

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