Today I spent some time on Gwenview, trying to get rid of an annoying bug: when you browse images in fullscreen or when you zoom into large images, sometimes the screen goes black for a few milliseconds.
The changes ended up being a bit more involved than I expected, but I got rid of most black screens. You may still get some when you go to a document of a "different kind" (going from a photo to an SVG for example) but you should not see black screens anymore when going through photos or zooming them in.
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