Issue #4204 - "Add Bevel" Has No Effect
In plug_in_compat.pdb, don't add child nodes to nodes containing an op, since this turns them into graphs and discards the op. Instead, add a new wrap_in_graph() helper function, which takes a node op and wraps it in a simple "input -> op -> output" graph. Use the graph as the container for child nodes, and as the node passed to gimp_drawable_apply_operation(). (This is similar to what we used to do before commit afdd5731, except that we now pass the parent node to gimp_drawable_apply_operation(), instead of the op node).
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