Filter custom block templates with PHP

This method calls get_block_templates once and uses block template properties
directly for filtering. This way, we can avoid hitting the database for each
public post type.

The previous method is useful when we already know the current post type we
request templates for, like when using REST API.

Follows [52334].
See #54335.
Props mamaduka, youknowriad.

Built from https://develop.svn.wordpress.org/trunk@52365


git-svn-id: http://core.svn.wordpress.org/trunk@51957 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-theme.php

@@ -1250,9 +1250,17 @@ public function get_post_templates() {
 			}
 
 			if ( current_theme_supports( 'block-templates' ) ) {
+				$block_templates = get_block_templates( array(), 'wp_template' );
 				foreach ( get_post_types( array( 'public' => true ) ) as $type ) {
-					$block_templates = get_block_templates( array( 'post_type' => $type ), 'wp_template' );
 					foreach ( $block_templates as $block_template ) {
+						if ( ! $block_template->is_custom ) {
+							continue;
+						}
+
+						if ( isset( $block_template->post_types ) && ! in_array( $type, $block_template->post_types, true ) ) {
+							continue;
+						}
+
 						$post_templates[ $type ][ $block_template->slug ] = $block_template->title;
 					}
 				}

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-beta2-52364';
+$wp_version = '5.9-beta2-52365';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.