https://bugs.kde.org/show_bug.cgi?id=488800

            Bug ID: 488800
           Summary: Clearing scratchpad while brush is lagging crashes
                    Krita
    Classification: Applications
           Product: krita
           Version: 5.2.2
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: General
          Assignee: krita-bugs-n...@kde.org
          Reporter: andrejpavlovi...@proton.me
  Target Milestone: ---

Created attachment 170689
  --> https://bugs.kde.org/attachment.cgi?id=170689&action=edit
Crash dump

SUMMARY
When using a performance intensive brush and drawing in the scratchpad, if the
stroke is lagging behind, clearing the scratchpad will cause Krita to crash to
desktop.

STEPS TO REPRODUCE
1. Use a performance intensive brush. Increasing size and enabling smudge
should be enough to make the stroke lag behind.
2. Open the brush editor and start drawing in the scratchpad.
3. While the stroke is lagging behind, press the button to clear the
scratchpad.

OBSERVED RESULT
Krita crashes to desktop.

EXPECTED RESULT
Scratchpad should be clear and not crash to desktop.

SOFTWARE/OS VERSIONS
Arch Linux 6.6.33-1-lts using X11
Krita 5.2.2-10 (repository)

ADDITIONAL INFORMATION
Bug has been tested and reproduced in 5.2.3-beta1 (appimage). Unknown if it
also affects other platforms.
Probably easier to reproduce on a slower system. 
Video of the bug is available on the forum thread:
https://krita-artists.org/t/bug-clearing-scratchpad-while-brush-is-lagging-crashes-krita/94260

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