Overview of Changes in GTK+ 3.7 to 3.9
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* GtkFileChooser:
 - Always show fuse-mounted locations in shortcuts
 - GtkFileChooserButton has received a lot of fixes and tests have
   been added for many of them

* GtkWindow:
 - Initial support for client-side decorations has been added. This
   is going to be used by default under Wayland. To try it with other
   backends, set the GTK_CSD=1 environment variable.
 - gtk_window_set_titlebar: A new function that can set a custom,
   client-side titlebar on toplevel windows.

* Wayland:
 - Use client-side decorations
 - Implement maximization
 - Improve cursor handling
 - Improve multi-monitor handling
 - Support most GtkSettings (for now by reading GSettings directly)
 - Complete the keymap implementation
 - Add support for custom surfaces
 - Implement animated cursors
 - Support the WAYLAND_SOCKET environment variable
 - Implement frame synchronizatio
 - Document Wayland-specific APIs

* Broadway:
 - Improve window size handling
 - Implement frame synchronization