Overview of Changes in GTK 3.98.2
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* Introduce GtkShortcutController, and replace key bindings,
  mnemonics and accelerators by GtkShortcut

* Derive the HighContrast theme from Adwaita

* GtkMenuButton: Add a use-underline property

* GtkTreeView: Fix cell editing

* Add gdk_toplevel_inhibit_system_shortcuts

* gtk-demo: Fix issues in multiple demos

* Translation updates:
 Polish