[kmail2] [Bug 431921] New: Black square appears sometimes in KMail

[Attila]

https://bugs.kde.org/show_bug.cgi?id=431921

            Bug ID: 431921
           Summary: Black square appears sometimes in KMail
           Product: kmail2
           Version: 5.15.3
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: bugs.kde.attila at online.de
  Target Milestone: ---

SUMMARY
This behaviour happens randomly but often when I read emails. Unfortunately I
can not tell how to reproduce. All I can say that this happens every couple of
days.
When I point the mouse to the black square the cursor turns from "default" to
"resize" (see screenshot).

SOFTWARE/OS VERSIONS
Operating System: Fedora 33
KDE Plasma Version: 5.20.5
KDE Frameworks Version: 5.78.0
Qt Version: 5.15.2
Kernel Version: 5.10.7-200.fc33.x86_64
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-4770T CPU @ 2.50GHz
Memory: 7.2 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4600

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