Overview of Changes in GTK 3.98.4
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* Themes
 - Refine menu styling
 - Tweak visible focus behavior
 - HighConstrast: Add public colors
 - HighContrast: Fix scale borders

* CSS:
 - Drop the nonstandard -gtk-icon-theme property
 - Add a system_setting_changed vfunc to propagate global changes

* Untangle titlebars from windows:
 - Add a GtkWindowControls widget
 - Add a GtkWindowHandle widget
 - Add actions for window menu items
 - Remove app menu fallback from GtkHeaderBar
 - Remove title and subtitle properties from GtkHeaderBar,
   rename custom-title to title-widget

* GtkWidget
 - Add a focusable property

* GtkPopover:
 -  Fix (re-)positioning issues

* GtkStack:
 - Drop the homogeneous property
 - Add a use-underline property to stack pages

* GtkScale:
 - Make area around the trough clickable

* GtkScrolledWindow:
 - Fix kinetic scrolling

* GtkTreeView:
 - Break reference cycles in unroot

* Drop GtkBin and GtkContainer. All existing GtkBin subclasses
  have grown a child property with setter and getter. All
  existing GtkContainer subclasses have grown widget-specific
  remove (and in some cases, add) functions. <child> in ui
  files continues to work as before

* Replace gtk_widget_destroy by gtk_window_destroy

* Drop the ::size-allocate signal. Use a GtkWidgetPaintable
  if you need to be informed about changes to a widgets
  content or size

* Remove gtk_dialog_run

* GDK:
 - Wayland: Provide a builtin cursor of last resort
 - Change the monitor api to use a GListModel

* GSK:
 - Don't include renderer-specific headers automatically
 - GL: Fix nested rounded clips

* Introspection:
 - Assorted annotation fixes

* Inspector:
 - Preview media resources
 - Show media backend information

* gtk4-widget-factory:
 - Add GtkVideo
 - Add text styles
 - Add a print dialog
 - Add a password entry
 - Improve toolbar styling
 - Revamp transition effects

* gtk4-demo:
 - Replace some demos

* Translation updates:
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