[krita] [Bug 404742] New: Mergedimage.png isn't rendered correctly in master.

[wolthera]

https://bugs.kde.org/show_bug.cgi?id=404742

            Bug ID: 404742
           Summary: Mergedimage.png isn't rendered correctly in master.
           Product: krita
           Version: git master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: File formats
          Assignee: krita-bugs-n...@kde.org
          Reporter: griffinval...@gmail.com
  Target Milestone: ---

SUMMARY
Mergedimage.png isn't rendered correctly, especially compared to the
preview.png file. Thumbnails thus look fine, but file layer and other
applications accessing the mergedimage.png do not.

STEPS TO REPRODUCE
1. Create a kra file with an image, a gradient for example.
2. Open the file with an unzipper
3. Look at mergedimage.png

OBSERVED RESULT
Mergedimage.png sometimes has missing blocks of pixels.

EXPECTED RESULT
Mergedimage.png looks like the merged image.

This does not always happen(the only file I had not seen it with was one with
only a single vector layer), but it does happen with images of 652x899(each
with a single vector layer and a raster layer), so it is not a size issue.

ADITIONAL
---------------------------------------------
Krita

  Version: 4.2.0-pre-alpha (git 0b5c34c)

Qt

  Version (compiled): 5.12.0
  Version (loaded): 5.12.0

OS Information

  Build ABI: x86_64-little_endian-lp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: linux
  Kernel Version: 4.15.0-45-generic
  Pretty Productname: KDE neon User Edition 5.15
  Product Type: neon
  Product Version: 18.04

OpenGL Info

  Vendor:  Intel Open Source Technology Center 
  Renderer:  "Mesa DRI Intel(R) UHD Graphics 620 (Kabylake GT2) " 
  Version:  "3.0 Mesa 18.2.2" 
  Shading language:  1.30 
  Requested format:  QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize -1,
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>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 0,
stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer,
swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::NoProfile) 
     Version: 3.0
     Supports deprecated functions true 
     is OpenGL ES: false 

Hardware Information

  GPU Acceleration: auto
  Memory: 7725 Mb
  Number of Cores: 8
  Swap Location: /tmp

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