Philipp Oeser
16d329da28
Main motivation is from T54314 where there was no way to read from a Viewer image datablock after the compositor has run. The only solution there was to do a full rerender (which obviously takes much longer). Adding a handler avoids having to rerender. This uses new syntax from rBf4456a4d3c97 and also adds "COMPOSITE" as a job type that can be queried by `bpy.app.is_job_running`. NOTE: there is another issue when multiple viewers are used and these get active via RNA (compo execution is not triggered there yet -- unlike when a viewer is selected in the Editor -- this is an issue of `ED_node_set_active` vs. only `nodeSetActive`, but this will be tackled separately) Maniphest Tasks: T54314 Differential Revision: https://developer.blender.org/D15078