Support zwp_idle_inhibit_manager_v1 protocol
With mutter 3.26.2-1 mpv reports this -
0.024][v][vo/gpu/opengl] Initializing GPU context 'wayland'
[ 0.024][v][vo/gpu] Enabling event driven renderloop!
[ 0.024][v][vo/gpu/wayland] Registered for protocol wl_compositor
[ 0.024][v][vo/gpu/wayland] Registered for protocol wl_shm
[ 0.024][v][vo/gpu/wayland] Registered for protocol wl_output
[ 0.024][v][vo/gpu/wayland] Registered for protocol wl_data_device_manager
[ 0.024][v][vo/gpu/wayland] Registered for protocol zxdg_shell_v6
[ 0.024][v][vo/gpu/wayland] Registered for protocol wl_seat
[ 0.024][v][vo/gpu/wayland] Compositor doesn't support the zwp_idle_inhibit_manager_v1 protocol!
Without this support screen blanking occurs during video playback after x time based on user setting (- default is 5 min