[wp-trac] [WordPress Trac] #59131: Introduce filters to modify/inspect the blocks returned by `do_blocks()`

[WordPress Trac]

#59131: Introduce filters to modify/inspect the blocks returned by `do_blocks()`
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 Reporter:  luisherranz  |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Editor       |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 The `do_blocks()` function provides a way to process blocks including
 block parsing and their subsequent rendering. Currently, it is impossible
 for plugins (including Gutenberg) to inspect those values or customize
 that logic.

 A couple of filters should be introduced that allow to modify or inspect
 the blocks before they are included in the final response:

 - The first one receives the array of parsed blocks returned by the
 `parse_blocks` function. This filter provides an easy way to inspect or
 even modify the blocks as a whole, and also gives the opportunity to know
 when a call to `do_blocks` has started.
 - The second one receives the final HTML rendered returned by the
 recursive call to `render_block`. This filter provides an easy way to
 inspect or even modify the final rendered output as whole, and also gives
 the opportunity to know when a call to `do_blocks` is about to finish.

 With the combination of these two filters, it's also possible to ignore
 nested calls of `do_blocks` and avoid processing the HTML of blocks more
 than once, something that is not possible today using `render_block`
 alone.

 Target is merging into 6.4.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59131>
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