https://bugs.kde.org/show_bug.cgi?id=423520

            Bug ID: 423520
           Summary: Weird GLITCH with Krita's rendering Engine
           Product: krita
           Version: 4.3.0-beta2
          Platform: MS Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: General
          Assignee: krita-bugs-n...@kde.org
          Reporter: tgdev...@gmail.com
  Target Milestone: ---

Created attachment 129684
  --> https://bugs.kde.org/attachment.cgi?id=129684&action=edit
glitch_while_painting

SUMMARY
There's a weird glitch that occurs with Krita's rendering engine while/after
you paint a stroke.
Krita version is Krita Plus and version is 4.3.0-beta2(4.3.1-alpha git 5e750f3)

STEPS TO REPRODUCE
Unsure but I believe steps are as follow :
1. Have a big brush(200 pixels or more)
2. Have multiple raster rectangles in a group(maybe in white color)
3. Set the group layer style to stroke(mine was center stroke mode)
4. Paint around the borders of the rectangles, where the rendered stroke is
visible.

OBSERVED RESULT
The brush temporarily erases the stroke rendered by the layer style and
sometimes, an thick intruding pixel line appears here and there.


EXPECTED RESULT
No glitch at all

SOFTWARE/OS VERSIONS
Windows 10 1909

Krita

 Version: 4.3.1-alpha (git 5e750f3)
 Languages: en_US, en, en_US, en, en_US, en, en_US, en, en_US, en, en_US, en,
en_US, en, en_US, en, en_US, en
 Hidpi: true

Qt

  Version (compiled): 5.12.8
  Version (loaded): 5.12.8

OS Information

  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 10.0.18363
  Pretty Productname: Windows 10 (10.0)
  Product Type: windows
  Product Version: 10

OpenGL Info

  Vendor:  "Google Inc." 
  Renderer:  "ANGLE (NVIDIA GeForce GT 640M Direct3D11 vs_5_0 ps_5_0)" 
  Version:  "OpenGL ES 3.0 (ANGLE 2.1.0.57ea533f79a7)" 
  Shading language:  "OpenGL ES GLSL ES 3.00 (ANGLE 2.1.0.57ea533f79a7)" 
  Requested format:  QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8,
stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer,
swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::CompatibilityProfile) 
  Current format:    QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8,
greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8,
samples 0, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 0,
colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::NoProfile) 
     Version: 3.0
     Supports deprecated functions false 
     is OpenGL ES: true 

QPA OpenGL Detection Info 
  supportsDesktopGL: true 
  supportsAngleD3D11: true 
  isQtPreferAngle: true 

Hardware Information

  GPU Acceleration: angle
  Memory: 12126 Mb
  Number of Cores: 4
  Swap Location: C:/Users/Yed/AppData/Local/Temp

Current Settings

  Current Swap Location: C:/Users/Yed/AppData/Local/Temp
  Current Swap Location writable: true
  Undo Enabled: true
  Undo Stack Limit: 400
  Use OpenGL: true
  Use OpenGL Texture Buffer: true
  Use AMD Vectorization Workaround: false
  Canvas State: OPENGL_SUCCESS
  Autosave Interval: 300
  Use Backup Files: false
  Number of Backups Kept: 1
  Backup File Suffix: ~
  Backup Location: Same Folder as the File
  Backup Location writable: false
  Use Win8 Pointer Input: false
  Use RightMiddleTabletButton Workaround: false
  Levels of Detail Enabled: true
  Use Zip64: false


Display Information
Number of screens: 1
        Screen: 0
                Name: \\.\DISPLAY5
                Depth: 32
                Scale: 1
                Resolution in pixels: 1600x900
                Manufacturer: 
                Model: 
                Refresh Rate: 60

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