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Prevent cyclic node mutations - #2558
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Node insertion and replacement methods now reject changes that would place a node beneath itself or one of its descendants, creating a cycle. Bulk mutations are checked before any changes are made, so a rejected operation leaves the tree unchanged.
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Node insertion and replacement methods now reject changes that would place a node beneath itself or one of its descendants, creating a cycle. Bulk mutations are checked before any changes are made, so a rejected operation leaves the tree unchanged.
Fixes #2552