Overview of Changes in GTK+ 3.22.0
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* Reduce some noisy warnings

* Improve positioning and sizing of popups on Wayland

* Update Adwaita assets

* Bugs fixed:
 602773 GdkEventKey.is_modifier is 0 for Shift, Ctrl, Alt keys
 771117 gtk3 3.21.5 broke displaying drop-down lists, need to scrol...
 771349 gdk_screen_get_monitor_scale_factor on X11 always returns 1...
 771568 Holding down a modifier key results in 100% cpu usage
 771561 Epiphany application mode on Wayland broken with WebKit...

* Translation updates:
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