gtk+ 3.22.21 release.

• Add input hints for Emoji, that let applications indicate whether entries would benefit from Emoji support or not
• Add support for cloud services in GtkPlacesSidebar. This adds a new, optional dependency on libcloudproviders

Bugs fixed:

• 468868 Popup of "appears-as-list" ComboBox does not change screen with its top...
• 618160 Documentation for gtk_combo_box_get_active_iter is unclear
• 705640 GtkWindow incorrectly requires a default screen
• 729651 Crash in GtkFileChooserButton with appears-as-list
• 759725 Setting Container:border-width on TextView breaks gesture positions
• 766909 Tooltip of the eject button is a bit confusing - or just missing
• 774134 GtkExpander: input window of title extends over child, if :expanded is ...
• 775074 GtkScrolledWindow does not disconnect all GtkAdjustment signal handlers...
• 776937 GtkExpander is incorrectly hiding content.
• 780750 Shift + click in GtkEntry doesn't select
• 783649 negative content width warning in GtkLevelbar
• 785306 FileChooserNativeQuartz: two fixes
• 785736 textview: fix bug on DnD displaced limits of selection
• 786029 clicking on gtk-slider makes the parent disappear
• 786123 GtkPlacesSidebar: Add support for libcloudproviders
• 786209 X11: GtkPopover positioning doesn't "avoid" CSD window shadows
• 786492 Incorrect scaling factor with Vulkan on Wayland
• 786553 Wrong example number in Gtk Tutorial
• 786771 Critical about mismatched GdkDisplays when opening Inspector combobox
• 786841 Emoji categories are always in English
• 786885 Add explanatory tooltip to emoji icon
• 786932 Let the "type-func" override the object's "class" attribute when gettin...
• 786938 Emoji picker wrongly opens when clicking on primary icon too
• 786940 ::icon-pressed handler stays connected when setting :show-emoji-icon to...
• 786960 Emoji chooser: don't show 'insert Emoji' item in emoji chooser context ...
• 786964 Emoji Chooser: Can't scroll clicking on the scroll bar
• 786966 Emoji chooser: unnecessary spacing b/w some rows in search result
• 786986 text_window_to_widget_coords broken when Container:border-width > 0
• 787103 gtk3-widget-factory crashes on exit after inserting an emote on page3
• 787158 gtk_widget_get_preferred_width on GtkToolbar gives wrong minimum width
• 787195 gtk_toolbar_set_show_arrow does not show an arrow
• 786956 EmojiChooser: Fix theming on Adwaita:dark, HighContrast, etc
• 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