https://bugs.kde.org/show_bug.cgi?id=400179

            Bug ID: 400179
           Summary: Brush stroke mirror copy has rectangular "hole"
                    artifacts
           Product: krita
           Version: 4.1.5
          Platform: MS Windows
                OS: MS Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Brush engines
          Assignee: krita-bugs-n...@kde.org
          Reporter: hitjim+...@gmail.com
  Target Milestone: ---

Created attachment 115841
  --> https://bugs.kde.org/attachment.cgi?id=115841&action=edit
rectangular hole artifacts in mirrored brush strokes

SUMMARY
Quick, high-thickness strokes appear to get rectangular "hole" artifacts
erratically.  I've exported to PNG to verify it's not just an editor view
artifact.  These holes appear in the PNG as well.

I'm using a new laptop with 1060 maxq video card.  Dell G7 16GB RAM.  Windows
10 Home.  I've updated NVidia drivers.  I've tried turning OpenGL off, and a
few different options in that same view... but not all of them.

STEPS TO REPRODUCE
1. new document 3508x2480
2. select a basic-5-size brush
3. Make numerous strokes of varying width, usually quickly, using varying
pressure on tablet

OBSERVED RESULT
The painted line will draw correctly, as will the mirror preview on the left -
however after releasing the stylus, the line may exhibit rectangular "hole"
artifacts.  I've verified that this happens regardless of which side of the
mirror I make my marks on.

EXPECTED RESULT
I would expect to not be missing rectangular chunks of the mirrored marks


SOFTWARE VERSIONS
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Krita
  Version: 4.1.5

Qt
  Version (compiled): 5.9.3
  Version (loaded): 5.9.3

OS Information
  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 10.0.17134
  Pretty Productname: Windows 10 (10.0)
  Product Type: windows
  Product Version: 10

OpenGL Info
  **OpenGL not initialized**

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