Update gtk3 to 3.20.6

Overview of Changes in GTK+ 3.20.6
==================================

* Bugs fixed:
 766694 crash on save as in any gtk3 application starting 3.20.5...
 766323 GTKPopover gives warnings if visible when reparented
 766336 Crash when selecting rows with rubberbanding
 766737 stack: Only map children when necessary

* Translation updates:
 Arabic


Overview of Changes in GTK+ 3.20.5
==================================

* Bugs fixed:
 763852 gdk/wayland: event source is not multi-thread aware
 765973 GtkRevealer need to always send "child-revealed" signal...
 766175 Translation of quotes may misinterpreted by GTK sidebar
 766233 Crash when server does not support XI2
 766440 Scale slider button has stopped discerning & rendering...
 766442 Broken drag & drop between windows

* Translation updates:
 Kazakh
 Portuguese

Overview of Changes in GTK+ 3.20.4
==================================

* Bugs fixed:
 573380 gtk_tree_model_iter_parent() fails if the same iterator is used for...
 620065 Several problems related to recent files
 693077 GtkRecentManager doesn't send "changed" when file is deleted
 749405 GtkMenuSectionBox doesn't remove submenus when parent item is removed
 761651 [Wayland] glade previewer is resizing windows until it crashes gnom...
 762756 keyboard focus problem on dismiss of menus under wayland
 763768 Wrong margin used for the sidebar separator
 764395 nautilus crashed on double clicking 'other locations'
 764424 `Super` keybindings trigger without Super, on Wayland
 764585 Fix "format not a string literal" errors
 764825 [WAYLAND] Fn key resets scrolling
 764846 Code improvements in GtkApplication
 765038 Adwaita & decorations
 765065 Wayland: Hover state stuck after mouse leaving the toplevel
 765066 GtkColorChooser looks like it can select multiple colors
 765122 Duplicate/missing string in gtkprintbackendcups
 765213 info bars nearly unreadable in backdrop state because of gray font ...
 765238 gtktexthandle should avoid connecting to GtkWidget::draw
 765261 listbox: Page up/Down don't do anything with large rows
 765270 wayland: Leave existing mods on map_virtual_modifiers
 765284 debug: reduce runtime overhead in debug builds
 765471 CellRendererText shows edit entry in a wrong position for small cells
 765474 Wayland: Dialogs without transient parent crash the inspector
 765486 builtinicon: avoid calculating font-metrics in vast majority of cases
 765493 kineticscrolling: avoid stutter at tail of kinetic deceleration
 765496 Clean up gtklabel.c a bit
 765565 Wayland: Inspector GtkLabel drag'n'drop crashes client
 765567 wayland: avoid jitter in keyboard repeat
 765592 frametimings: reuse previous frame timing in common case
 765640 pixelcache: reuse existing timeout source when possible
 765644 Widget sizing problems with GtkProgressBar
 765742 GtkRedioButton and GtkCheckButton doesn't aligned right to left lan...
 765790 W32: configure does not tell which cairo version to use
 765907 [Wayland] Reversed scrolling GDK_SCROLL_UP/GDK_SCROLL_DOWN in Wayland
 765922 GtkScale labels extend past edge of widget and overlap neighboring ...
 765981 fts warning from tracker when searching for files with "-" in name
 766166 key bindings in gtk.css are ignored

* Translation uypdates:
 Brazilian Portuguese
 Latvian
 Polish
 Traditional Chinese

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