copyToClipboard only shallow copies subgraphs #5002
Description
The copyToClipboard method of LGraphCanvas only walks the current graph for determining which subgraphs need to be serialized.
Getting to an actual visible error requires more steps than expected
- Double nest a subgraph
- Copy from the top level
- Paste into a new workflow
- At this point, the workflow verifiably only contains the single subgraph, but the nested one can still be viewed
- Isolate from the parent workflow (closing it is sufficient)
- Reload, and an error is thrown for non-existant subgraph
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