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Ell authored
For pass-through groups, we want to use the group's layer-stack graph directly in its filter node, in place of the drawable's buffer-source node. Add a get_source_node() vfunc to GimpDrawable, which defaults to returning the buffer-source node, and use it in gimp_drawable_get_source_node() instead of using the buffer-source node directly. We'll later override this function for GimpGroupLayer.
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