fix: Fix serialization of the lists_split block. #8702
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The basics
The details
Resolves
Fixes #8692
Proposed Changes
This PR updates the
lists_splitblock's implementation to serialize the state of the mode (join vs split) field. While as the old comment notes the field validator does update this, during block serialization blocks are connected to their parents before having their field values set, so at the time of connection the field validator has not yet run to set the appropriate connection check, so the block and its parent become separated due to the connection check failing. Now, the extra state will be deserialized early, update the connection checks, and allow the block to be connected to its parent during deserialization. Note that this will not resolve already-saved projects with this issue, but it will fix it going forward.