Media: Make `get_post_galleries()` only return galleries.

This change makes sure only gallery content is returned by `get_post_galleries()`. It fixes an issue where non gallery block content was also returned by the function.

Props BinaryMoon, costdev, glendaviesnz.
Fixes #55203.

Built from https://develop.svn.wordpress.org/trunk@52797


git-svn-id: http://core.svn.wordpress.org/trunk@52386 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/media.php

@@ -4780,9 +4780,12 @@ function get_post_galleries( $post, $html = true ) {
 				continue;
 			}
 
-			// All blocks nested inside non-Gallery blocks should be in the root array.
-			if ( $has_inner_blocks && 'core/gallery' !== $block['blockName'] ) {
+			// Skip non-Gallery blocks.
+			if ( 'core/gallery' !== $block['blockName'] ) {
+				// Move inner blocks into the root array before skipping.
+				if ( $has_inner_blocks ) {
 					array_push( $post_blocks, ...$block['innerBlocks'] );
+				}
 				continue;
 			}
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-alpha-52796';
+$wp_version = '6.0-alpha-52797';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.