- update to 0.12.1:
  - GLib >= 2.44.0
  - Optimize sorting by content type
  - Load images asynchronously (#16, #29, #32, !34)
  - Increase image loading buffer size (!34)
  - Allow to display all files in the open dialog (!33)
  - Rework the file opening procedure (!33)
  - Fix a memory leak when closing the window directly
  - Refactoring: Clarify thumbnailer queue management
  - Thumbnailer: Do not empty an unprocessed file list
  - Update window title on image deletion or insertion
  - Perform content-based filtering wherever necessary
  - Set device scale for animated images
  - Properly recognize SVG compressed image files
  - Use the generic pixbuf loader for RAW image files
  - Fix pointer behavior in fullscreen mode
  - Icon bar: Properly highlight item under the cursor
  - Icon bar: Center on the active item for any size change
  - Fix regression: Exif orientation is not respected (#69)
  - Do not try to load images whose pixbuf is not available (!34)
  - Fix memory management of image loading objects (!34)
  - Use URIs instead of filenames in the `.desktop` file (#49)
  - Directory loading: Allow to load a directory via the cli
  - Flatpak: Access remote locations with GVfs
  - Directory loading: Fix improper use of GFileEnumerator APIs (#68)
  - Translation Updates:

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