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Adding a unit test for unhappy paths might be a good idea. When post_content returns something different due to the filter.

@ockham, is this ready for review?

@ockham, is this ready for review?

Not quite yet -- I still need to increase test coverage, and audit other callsites of apply_block_hooks_to_content to see if they should be changed to call apply_block_hooks_to_content_from_post_object instead.

I won't be able to work on this PR this week, but I'll continue work next week. I hope that works for you time-wise, @Mamaduka?

Thanks, @ockham!

That timeline should be okay for now. We just need to make sure this is merged before Beta 1.

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Core Committers: Use this line as a base for the props when committing in SVN:

Props bernhard-reiter, gziolo, mamaduka.

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Switching back to draft mode since I might've encountered a bug while testing.

Edit: Figured it out, see below.

Note that when testing this with a block theme (e.g. TT5), hooked blocks in the first_child or last_child positions of the Post Content block will be inserted twice. E.g. when using this plugin for testing:

This problem will go away once changes to the Post Content block that were made in WordPress/gutenberg#68926 are synced over to Core.

diff --git a/src/wp-includes/blocks/post-content.php b/src/wp-includes/blocks/post-content.php
index e0a06b7217..25be880cc4 100644
--- a/src/wp-includes/blocks/post-content.php
+++ b/src/wp-includes/blocks/post-content.php
@@ -46,33 +46,10 @@ function render_block_core_post_content( $attributes, $content, $block ) {
 		$content .= wp_link_pages( array( 'echo' => 0 ) );
 	}
 
-	$ignored_hooked_blocks = get_post_meta( $post_id, '_wp_ignored_hooked_blocks', true );
-	if ( ! empty( $ignored_hooked_blocks ) ) {
-		$ignored_hooked_blocks  = json_decode( $ignored_hooked_blocks, true );
-		$attributes['metadata'] = array(
-			'ignoredHookedBlocks' => $ignored_hooked_blocks,
-		);
-	}
-
-	// Wrap in Post Content block so the Block Hooks algorithm can insert blocks
-	// that are hooked as first or last child of `core/post-content`.
-	$content = get_comment_delimited_block_content(
-		'core/post-content',
-		$attributes,
-		$content
-	);
-
-	// We need to remove the `core/post-content` block wrapper after the Block Hooks algorithm,
-	// but before `do_blocks` runs, as it would otherwise attempt to render the same block again --
-	// thus recursing infinitely.
-	add_filter( 'the_content', 'remove_serialized_parent_block', 8 );
-
 	/** This filter is documented in wp-includes/post-template.php */
 	$content = apply_filters( 'the_content', str_replace( ']]>', ']]>', $content ) );
 	unset( $seen_ids[ $post_id ] );
 
-	remove_filter( 'the_content', 'remove_serialized_parent_block', 8 );
-
 	if ( empty( $content ) ) {
 		return '';
 	}

Heads-up, I'm thinking to include changes from WordPress/gutenberg#69241 in this. (Should take a couple of minutes only.)

Heads-up, I'm thinking to include changes from WordPress/gutenberg#69241 in this. (Should take a couple of minutes only.)

Done: 970eef5

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 59838
GitHub commit: d455334

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.