Overview of Changes in GTK+ 3.22.21
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* Bugs fixed:
 738893 ComboBox in appears-as-list mode: Finishing scroll with mouse causes...
 786613 Adwaita: provide a generic sidebar icon and label styling
 787172 EmojiChooser: Improve selection of section buttons
 787279 EmojiChooser: Hovered emoji become impossible to see in HighContrast...
 787280 HighContrast: Fix regression in vertical separator in titlebar headerbar
 787410 entry: fix memory leak

* Translation updates:
 Basque
 Catalan
 Croatian
 Czech
 Danish
 Finnish
 German
 Polish
 Slovenian
 Spanish
 Swedish
 Turkish