kleines Filmröllchen 5294fd671e PixelPaint: Use the parallel ImageProcessor to apply filters ...

The main advantage of this change is that heavy-weight filters do not
lock up the GUI anymore.

This first cut has several flaws:
- We do not account for modification of the referenced images while the
  filter is running. Depending on the exact filter behavior this might
  have all sorts of weird effects. A simple fix would be to show a
  progress dialog to the user, preventing them from performing other
  modifications in the meantime.
- We do not use the image processor for previews. Preview behavior has a
  couple of other considerations that are intentionally not addressed in
  this commit or pull request.

2022-09-27 14:23:11 +01:00

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