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During work on #59399, it was discovered that ''sibling'' block insertion wasn't likely going to work the way it was planned, which required devising an alternative solution. This new solution requires some changes to `traverse_and_serialize_block(s)`: - Change the signature of the existing callback such that: - the return value is a string that will be prepended to the result of the inner block traversal and serialization; - the function arguments are: a ''reference'' to the current block (so it can be modified inline, which is important e.g. for `theme` attribute insertion), the parent block, and the previous block (instead of the block index and chunk index). - Add a second callback argument to `traverse_and_serialize_block(s)`, which is called ''after'' the block is traversed and serialized. - Its function arguments are a reference to the current block, the parent block, and the next block. Props gziolo. Fixes #59412. See #59313. git-svn-id: https://develop.svn.wordpress.org/trunk@56644 602fd350-edb4-49c9-b593-d223f7449a82