Temporarily freezes a window and all its descendants such that it won't receive expose events.
This symbol was never meant to be used outside of GTK+
The window will begin receiving expose events again when thaw_toplevel_updates_libgtk_only is called. If freeze_toplevel_updates_libgtk_only has been called more than once, thaw_toplevel_updates_libgtk_only must be called an equal number of times to begin processing exposes.
This function is not part of the GDK public API and is only for use by GTK+.
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