[krita] [Bug 440740] New: Changing any attribute of a brush that uses texture patterns, can cause the brush's pattern to reset to the "01_canvas.png" pattern

[fizzyflower]

https://bugs.kde.org/show_bug.cgi?id=440740

            Bug ID: 440740
           Summary: Changing any attribute of a brush that uses texture
                    patterns, can cause the brush's pattern to reset to
                    the "01_canvas.png" pattern
           Product: krita
           Version: nightly build (please specify the git hash!)
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Brush engines
          Assignee: krita-bugs-n...@kde.org
          Reporter: brightpiepomegran...@protonmail.com
  Target Milestone: ---

Created attachment 140587
  --> https://bugs.kde.org/attachment.cgi?id=140587&action=edit
gif that shows the bug

SUMMARY

When an attribute is changed on a brush that uses texture patterns, for example
the brush tip size or rotation, the texture pattern can reset to the 
"01_canvas.png" pattern. This is also the first pattern indexed in Krita. I
don't experience this bug happening with every brush that uses texture
patterns. Such as the watercolor brushes or rgba brushes 

With texture brushes affected by this bug, opening the brush editor and opening
the pattern selector shows that the "01_canvas.png" pattern is already
selected. Even if the brush uses a different pattern by default. If a brush
present is cloned from the affected texture brush, the new clone brush will be
affected too

It can go away by restarting Krita. But the next time Krita is opened it will
come back. 

Before testing this I deleted my resource folder. The brushes I tested were
default brushes. The default texture brushes that I observed were affected by
this bug were 

1.h)Chalk Details
2.g)Dry Brushing
3.i)wet textured soft
4.k)Blender Textured Soft
5.y)Texture Wood Fiber 

STEPS TO REPRODUCE
1. Select a affected texture brush like "h) Chalk Details"
2. Edit any attribute of the brush in the brush editor

OBSERVED RESULT

The brush will reset to the "01_canvas.png" texture pattern

EXPECTED RESULT
The texture doesn't change unless the user selects a new texture

Experienced this bug in Windows and Linux

SOFTWARE/OS VERSIONS
Windows 10 
Linux 

ADDITIONAL INFORMATION
Tested with krita-nightly-x64-5.0.0-prealpha-0ac7ece6ae and a older Krita
nightly from June. Krita 4.4.5 doesn't appear to have this bug.

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