Overview of changes in 3.19.4
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* Support saturation adjustment
* Bugs fixed:
746940 preview-nav-buttons: Crashes if shutdown and fade_out_button coincide
759155 tool-colors: Restrict the range of the brightness slider
759156 application, base-item: Preserve metadata when saving
759331 Don't show empty albums in favorites
759363 Explicit exports functionality with more options
759521 application: Adapt to Grilo 0.3.0 API changes
760865 theme: Don't use deprecated pseudo classes
