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`g_clear_signal_handler()` is usually cleaner and saver than `g_signal_handler_disconnect()`. We use it new code, lets also adopt the existing one. See also mutter!868 and mutter!940 !842
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`g_clear_signal_handler()` is usually cleaner and saver than `g_signal_handler_disconnect()`. We use it new code, lets also adopt the existing one. See also mutter!868 and mutter!940 !842