[krita] [Bug 509373] New: When increasing the canvas size, some new area is incorrectly shown as transparent until interacting with it

[Igor]

https://bugs.kde.org/show_bug.cgi?id=509373

            Bug ID: 509373
           Summary: When increasing the canvas size, some new area is
                    incorrectly shown as transparent until interacting
                    with it
    Classification: Applications
           Product: krita
      Version First 5.2.11
       Reported In:
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: * Unknown
          Assignee: krita-bugs-null at kde.org
          Reporter: igorscorched at gmail.com
  Target Milestone: ---

Created attachment 184885
  --> https://bugs.kde.org/attachment.cgi?id=184885&action=edit
Restoring the image to normal rendering state, tile by tile, by drawing on it

SUMMARY

When increasing the canvas size, some new area is incorrectly shown as
transparent until interacting with it. Please see the screenshot for the idea
of how it gradually, tile by tile, refreshes to the normal state.

STEPS TO REPRODUCE
1. Create a new image
2. Activate the Freehand Brush tool
3. Choose some non-while color as a foreground color
4. Go to Image → Resize in the top menu, increase width by 200 pixels and press
OK
5. Observe that some or all area of the image is shown as transparent, or try
to scroll the image with the middle mouse button – and after that the image may
be shown as transparent
6. Then after drawing on it, for example, it’s made visible again in some
chunks affected by drawing (such as on the attached screenshot)

OBSERVED RESULT

The image is fully or partially rendered as the checkers pattern (for
transparency), which is incorrect.

EXPECTED RESULT

Image shouldn’t require any actions from the user to be rendered properly.

SOFTWARE/OS VERSIONS
Windows: not tested
macOS: 
   Apple M1 Pro laptop, 16 GB RAM

  Build ABI: arm64-little_endian-lp64
  Build CPU: arm64
  CPU: arm64
  Kernel Type: darwin
  Kernel Version: 22.6.0
  Pretty Productname: macOS 13.7
  Product Type: osx
  Product Version: 13.7
Linux/KDE Plasma: not tested
KDE Plasma Version: n/a
KDE Frameworks Version: n/a
Qt Version: 5.15.7

ADDITIONAL INFORMATION

Observed in many Krita versions in a row, reporting only now

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