Bug ID: 383271
           Summary: Wiggles in strokes size, when pressure size graph is
                    edited (both global and per brush)
           Product: krita
           Version: git master
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
  Target Milestone: ---

Created attachment 107147
tablet log

I get wiggles or jitters in size of a brush at higher brush sizes when I edit
the size pen pressure graph, default 45 degree line is doesn't give the

the problem can be seen on big brush size and most probably when drawing zoomed
in the canvas.

I have attached a video demonstrating the problem, although the stroke in video
has less of those jitters, i get varying amount of jitters , i have also
attached a screenshot of the same. I am also attaching the brush preset used in
this test. Any brush can be used, but to have a consistent test i am attaching
the preset here. Tablet log is also attached.

To reproduce:

1) copy the brush preset attached here, Open krita and a new document of A4

2) choose the brush preset (pack01_inkbrush_ and xhange the brush diameter to
something around 300 to 350 px.

3) Draw across the canvas , make an 'S' may be.

*Actual results*

jitter lines at the beginning of the stroke

*Expected results*

smooth stroke.

This can be reproduced in 4.0 alpha appimage, 3.2rc appimage and also krita
built from master.

My tablet driver is libinput 1.8.1-1 , Os is arch linux, graphic driver is
Nvidia proprietary 384.59-2. Opengl is enabled.

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