[krita] [Bug 443375] New: After applying a G'Mic filter, GL canvas updates clear the canvas.

[vanyossi]

https://bugs.kde.org/show_bug.cgi?id=443375

            Bug ID: 443375
           Summary: After applying a G'Mic filter, GL canvas updates clear
                    the canvas.
           Product: krita
           Version: git master (please specify the git hash!)
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: OpenGL Canvas
          Assignee: krita-bugs-null at kde.org
          Reporter: ghevan at gmail.com
  Target Milestone: ---

Created attachment 142199
  --> https://bugs.kde.org/attachment.cgi?id=142199&action=edit
video of after event erasing canvas.

git(ad830678eda)


STEPS TO REPRODUCE
1. on MacOS Apply any G'Mic filter

OBSERVED RESULT
When the cursor enters the canvas it gets totally or partially erased.
This is preserved only for that step, in the video after undo/redo the canvas
is shown, but if the pointer enter the canvas the textures are made transparent
(as shown in the attached video). Adding new strokes does not inherit the
issue, but the stroke steps from gmic will always preserve this issue.


This seems to be related to the new threaded texture buffer patch. It is not
present on windows according to my tests.

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