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Jacques Lucke f6ec11741c Fix #106208: data-block socket defaults not used for node group ...

The main challenge is to avoid dangling pointers. Currently, the lifetime of socket
declarations is somewhat unbounded (at least we didn't restrict it explicitly yet).
Therefore, storing non-owning pointers in it tricky. For ID pointers one could
potentially use the foreach-id iterator to update pointers in declarations as well,
but that's a bit out of scope and might not be the right solution anyway, since it's
not obvious that all node declarations are reachable from IDs stored in `bmain`.

The solution now is to use a callback that retrieves the right ID pointer when it
is used. The important thing is that the callback does not capture any potentially
dangling pointer either.

Pull Request: blender/blender#107179

2023-04-20 22:27:45 +02:00

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