app: gdk_threads_(enter|leave)() deprecated since GDK 3.6.
There are no replacements. Just we must make sure that all GTK+/GDK calls are run from the main thread, which is already what we were doing. Actually I don't even think these were doing anything as we were not calling gdk_threads_init() so the default lock functions were not set anyway. These were just bogus calls.
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