https://bugs.kde.org/show_bug.cgi?id=415773

            Bug ID: 415773
           Summary: Krita 4.2.8 freezes when SHIFT-resizing brush
           Product: krita
           Version: 4.2.8
          Platform: Appimage
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: General
          Assignee: krita-bugs-n...@kde.org
          Reporter: kruth...@kruthers.net
  Target Milestone: ---

Using SHIFT + left mouse button click & drag to resize the brush causes krita
to freeze for long periods of time.  This only happens in 4.2.8; the problem is
not there in 4.2.7-beta1.  Identical behavor happens when using a tablet
instead of the mouse.

See this video for a demonstration:    https://vimeo.com/382303909


STEPS TO REPRODUCE
1. Use a brush like airbrush_soft with a simple circular outline
2. shift-click-drag on the canvas for a few seconds to try to resize brush
3. wait for up to a minute for krita to become responsive again

OBSERVED RESULT
Krita freezes but not permanently; it will eventually wake up.

EXPECTED RESULT
Same as 4.2.7, or even more responsive would be nice. ;)

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:       Kubuntu 18.04
KDE Plasma Version:     5.12.9
KDE Frameworks Version: 5.44.0
Qt Version:             5.9.5


ADDITIONAL INFORMATION

> uname -a
Linux mephistopheles 4.15.0-72-generic #81-Ubuntu SMP Tue Nov 26 12:20:02 UTC
2019 x86_64 x86_64 x86_64 GNU/Linux

CPU: AMD Athlon II X4 640 (4 cores)

Nvidia driver version: 390.129

In Krita settings, Canvas Graphics Acceleration is ON

Both 4.2.7-beta1 and 4.2.8 are the appimage releases.

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