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Load thumbnails for recent files in separate thread (bug 414111)

Felipe Lema requested to merge morenonatural/krita:threaded-recent-files-squashed into master

Launch a "document thumbnailer" in a separate thread. This improves startup times as much as it can take thumbnailing a file. This can take quite a while when doing several ~700MB tiff files as reported here

Test Plan

  • Launch Krita
  • Load (optionally close right away) several heavy files that can take seconds to generate a thumbnail for
  • Close Krita
  • OPTIONAL: move the tiffs to a separate location
  • Launch Krita
  • See how the recent file thumbnails get populated
  • If some tiff files were relocated in OPTIONAL step, see how the items are disabled and removed later

Formalities Checklist

  • I confirmed this builds.
  • I confirmed Krita ran and the relevant functions work.
  • I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!)
  • I made sure my commits build individually and have good descriptions as per KDE guidelines.
  • I made sure my code conforms to the standards set in the HACKING file.
  • I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.

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