output-group: new helper
wlr_output_group allows compositors to group multiple outputs together and manage them as a single wlr_output. It's useful for output mirroring, and in the future for handling tiled displays.
wlr_output_group allows compositors to group multiple outputs together and manage them as a single wlr_output. It's useful for output mirroring, and in the future for handling tiled displays.