kleines Filmröllchen d707c0a2f5 LibGUI: Make thumbnail generation resilient between FileSystemModels ...

With the new canceled background actions, some thumbnail generation
callbacks are not executed if the user closes the window with a
FileSystemModel quickly enough. Therefore, we remember which thumbnails
we started to generate and consider the associated promises if we're
looking up a thumbnail. Since the thumbnail generation itself continues
running and the cache is application-global, instead of never displaying
thumbnails for images that were "interrupted" generating thumbnails the
first time, we can now fetch their images immediately and reliably.

2023-03-13 12:12:17 +00:00

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