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Ensure the server can safely handle client requests for wl_seat resource that have become inert due to weston_seat object release and subsequent destruction. The clean-up involves, among other things, unsetting the destroyed weston_seat object from the user data of wl_seat resources, and handling this NULL user data case where required. The list of sites extracting and using weston_seat object from wl_seat resources which were audited for this patch are: Legend: N/A = Not Applicable (not implemented by weston) FIXED = Fixed in the commit OK = Already works correctly == keyboard_shortcuts_inhibit_unstable_v1 == [N/A] zwp_keyboard_shortcuts_inhibit_manager_v1.inhibit_shortcuts == tablet_input_unstable_v{1,2} == [N/A] zwp_tablet_manager_v{1,2}.get_tablet_seat == text_input_unstable_v1 == [FIXED] zwp_text_input_v1.activate [FIXED] zwp_text_input_v1.deactivate == wl_data_device == [FIXED] wl_data_device_manager.get_data_device [OK] wl_data_device.start_drag [FIXED] ...8480d13f
