Log Message:
gtk3+: update to 3.22.26.

Overview of Changes in GTK+ 3.22.26
===================================

* Bugs fixed:
 789630 Distribute protocol/server-decoration.xml in tarballs
 787142 input/IME: Defer the emit of the "commit" signal
 789134 icon-browser: Centre Copy button in dialog again
 789678 AboutDialog: Fix accepting GTK_LICENSE_AGPL_3_0
 788898 Inspector: better default split of CSS nodes/props
 789733 Fix GtkEntry:has-frame not working
 789213 gdk/win32: Fix Win32 GL Context switching
 785176 placessidebar: add starred location item

* Translation updates:
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