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PreviewJob: handle previews bigger than 1024 in size

Méven Car requested to merge work/meven/preview-huge-pictures into master

This does two things:

  • set a default thumbdir, when the size requested does not fit in others, we could instead not cache the preview in those cases arguably.
  • adds a xxx-large thumbdir, for preview bigger than 1024 in width or height.

The 2056 image-cache occurs when the users uses 512x512 previews on 2 dpr and doubles the size to make sure to have a better rendering, ending-up with a preview size of 2056.
A bigger size than strictly necessary allows to use downscaling instead of upscaling when rendering the image, which brings a higher level of details.

cc @broulik as you might be the right person to have a clue about this.

Edited by Méven Car

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