https://bugs.kde.org/show_bug.cgi?id=447659

            Bug ID: 447659
           Summary: Some MyPaint brushes not doing curves properly
           Product: krita
           Version: 5.0.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: Brush engines
          Assignee: krita-bugs-n...@kde.org
          Reporter: rafa...@outlook.com.br
  Target Milestone: ---

Created attachment 144940
  --> https://bugs.kde.org/attachment.cgi?id=144940&action=edit
image comparing the regular krita brush (Ink pen at the leftmost corner) with
some of the mypaint brushes

SUMMARY
After the 5.0.0 update (and oh boy what a christmas gift it was! Amazing
update!) I've been testing the new MyPaint brushes, and a few of them have an
issue when using the AppImage (Kubuntu 21.10), the brushes don't do quick
strokes nicely and lag behind, leaving weird straight lines, almost if the
curve itself was low poly.


STEPS TO REPRODUCE
1. Open up Krita 5 appimage on Ubuntu 21.10/Kubuntu 21.10 with newest DIGImend
drivers (10/10.4)
2. Create a document and choose the MyPaint pencil (Pencil 2b Sketch or Ink
pen)
3. Quickly draw spheres and spirals

OBSERVED RESULT
The curves on some of the MyPaint brushes don't look proper, it's as if the
brush engine lagged behind and couldn't draw them smoothly enough.

EXPECTED RESULT
You should see curves looking exactly how you expect them according to your
hand motions.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  Kubuntu 21.10
(available in About System)
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.13.0-22 generic (64-bit)
Currently using X11

ADDITIONAL INFORMATION
I've tested the new version on Windows 10 and it works perfectly there without
any issues. Not all MyPaint brushes suffer from this issue as seen in the
attachment

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