Overview of Changes in GTK+ 3.23.1
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* Backported event controllers from GTK+ 4:
 - GtkEventControllerScroll
 - GtkEventControllerMotion
 - GtkEventControllerKey
 - GtkGestureStylus

* Support markup in GtkModelButtons

* Themes
 - The Raleigh theme has been removed
 - Expander size in HighContrast has been increased
 
* Wayland
 - Update cursor scale when needed
 - Decoration negotiation protocol fixes

* Windows
 - Add an EGL renderer based on ANGLE

* Translation updates:
 - Brazilian Portuguese
 - German
 - Hungarian