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Whether a surface needs to keep the committed wl_buffer un-released depends on what role the surface gets assigned to. For example a cursor role may need an unreleased shm buffer in order to create a hw cursor from it. In order to support this, keep a separate reference and use count to the buffer on behalf of the in the future assigned role, and release those references after the surface was assigned a role. A role that needs its own references and use counts, must in its assign function make sure to add those. https://bugzilla.gnome.org/show_bug.cgi?id=762828