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In current implemetation, user cannot copy the layout and elements to other container. This is not problem with simple layouts, but for example to setup GridBagLayout lasts long time. Now there is no way how to move it to other container (no copy/paste for layouts + generated code is in guarded block)
Mostly copying whole container should be enough. It is not enough only if you need different target container type, or if the source container is e.g. JFrame. Also the layout in the target container might clash with the layout you copy from another container. This would require some experimenting. I'd rather like to have a "Change container type" or "Group into container" actions.