https://bugs.kde.org/show_bug.cgi?id=417673

            Bug ID: 417673
           Summary: Visible tiling artifacts from Filter Masks
           Product: krita
           Version: nightly build (please specify the git hash!)
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Filter Layers
          Assignee: krita-bugs-n...@kde.org
          Reporter: manuel.snudl.zeid...@gmail.com
  Target Milestone: ---

SUMMARY
Tiling artifacts can appear on the rendered image when using a convolution type
filter on a Filter Mask. Interestingly, the same artifacts don't seem to appear
if a Filter Layer is used instead, and even mitigate the artifacts if the
Filter Layer is placed on top of the Filter Masks.

I'll attach a small test document.

STEPS TO REPRODUCE
1. Open the test file.
2. Repeatedly hide and unhide the Fill Layer on the bottom of the stack and
wait for the recalculated render.

OBSERVED RESULT
There will be visual artifacts at the edges of the render tiles, different each
time, depending on when exactly the tiles complete.

EXPECTED RESULT
No such artifacts.

SOFTWARE/OS VERSIONS
Tested in 4.2.8, most recent Next AppImage, and Dmitry's
fix-deadlock-on-loading-415891 branch.

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