https://bugs.kde.org/show_bug.cgi?id=414386

            Bug ID: 414386
           Summary: 'Split Alpha' creates unexpected edges with some brush
                    blending modes
           Product: krita
           Version: nightly build (please specify the git hash!)
          Platform: MS Windows
                OS: MS Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: General
          Assignee: krita-bugs-n...@kde.org
          Reporter: acc4commissi...@gmail.com
  Target Milestone: ---

Created attachment 124057
  --> https://bugs.kde.org/attachment.cgi?id=124057&action=edit
the file

SUMMARY
git f41bc3f

'Split Alpha' (+ other alpha-related operations) creates unexpected edges with
some brush blending mode.

I'm not sure it's related to Bug 410516, but it produces very similar results.



STEPS TO REPRODUCE
1. Draw something on the layer with various brush blending modes.
2. Layers docker > Right click > Split alpha > Alpha into mask
3. Uncheck the visible option of its transparency mask.

OBSERVED RESULT
Edges of brushstrokes appear in various shapes. 
'Normal' produces blocky edges.
'Overlay', 'Screen', 'Soft Light (SVG)', 'Multiply' etc produces sharp edges
with artifacts.
Only 'Luminosity / Shine (SAI)' produces the smooth result. 

EXPECTED RESULT
It shouldn't vary, I guess?


SOFTWARE/OS VERSIONS
Windows: Win7
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

Plus, there's this weird black triangles appears in vector text areas...

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