render layer nodes in a pinned tree from different scene. The way these updates work is a nasty legacy hack: https://developer.blender.org/diffusion/B/browse/master/source/blender/nodes/composite/node_composite_tree.c$277 This function is called //very frequently// by the get_from_context method. However, this does not get called for pinned node trees, so when showing a different scene's compositing nodes in the editor they may not get updated correctly. Now moved this update call out of get_from_context so it happens in any case. Will be called no more frequently than before (on every redraw). Eventually the depsgraph should handle this more precisely, it's just a simple ID dependency anyway ...