- Update to version 3.12.0:
  + New features and user visible changes:
    - Added ability to load AVIF/HEIF images using libheif.
    - Added ability to save images as AVIF.
    - Add JPEG XL (*.jxl) read support.
    - File manager: added file actions to the viewer
      context menu.
    - Extensions: removed facebook and picasaweb uploaders.
    - Image viewer: use a proportional zoom increment.
    - Read color profiles from png files as well.
    - Media viewer: use accurate seeking when clicking on
      the progress bar.
    - Media viewer: show the pointed time when hovering over
      the progress bar.
    - Preferences: added option to show/hide the statusbar.
    - Rename files: added a button to revert to the last
      used template.
    - Added configurable shortcuts for Save and Save As.
    - Media viewer: added keyboard shortcuts.
    - File list: always allow to use Control-A to select
      all files.
    - Allow to set shortcuts to activate filters.
    - Added a template editor to edit text values with
      special codes: script commands, rename templates,
      print header and footer, etc.
    - Faster navigation when a directory contains
      thousands of images.
    - File list: start more thumbnailers in parallel.
    - Allow to mount unmounted volumes.
    - Color picker: added other formats: rgb in % and hsl.
    - Allow to keep browsing while executing long-running
      external tools.
    - Status bar: added button to show the progress dialog.
    - File properties: do not reset the selection after showing
      another image.
    - Histogram: show the properties in a single column
      to save horizontal space.
  + Bugs fixed:
    - Install the gThumb import desktop file.
    - Fix memory leak when loading webp, jxl, avif images.
    - Check if image is null before using it. 
    - Added a Flatpak manifest.
    - Contact sheet: fixed themes list always empty.
    - Raw: Make compatible with LibRaw 0.21
    - Folder context menu: do not allow to move if cannot delete.
    - Folder context menu: do not allow to copy not mounted
      volumes.
    - Terminal: enable only for local folders.
    - Lots of others small fixes. (forwarded request 920243 from polslinux)

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