Plugin: Bump minimum required WordPress version to 6.6 (#67117)

And remove WP 6.6 compat layer.

.github/workflows/performance.yml

@@ -69,13 +69,13 @@ jobs:
             - name: Compare performance with base branch
               if: github.event_name == 'push'
               # The base hash used here need to be a commit that is compatible with the current WP version
-              # The current one is 5f4c9c853b15092ed885d5280edefb973c37d9e9 and it needs to be updated every WP major release.
+              # The current one is c7722262e65a3f4d0f1a2d1ad29eccb2069509e4 and it needs to be updated every WP major release.
               # It is used as a base comparison point to avoid fluctuation in the performance metrics.
               run: |
                   WP_VERSION=$(awk -F ': ' '/^Tested up to/{print $2}' readme.txt)
                   IFS=. read -ra WP_VERSION_ARRAY <<< "$WP_VERSION"
                   WP_MAJOR="${WP_VERSION_ARRAY[0]}.${WP_VERSION_ARRAY[1]}"
-                  ./bin/plugin/cli.js perf $GITHUB_SHA 5f4c9c853b15092ed885d5280edefb973c37d9e9 --tests-branch $GITHUB_SHA --wp-version "$WP_MAJOR"
+                  ./bin/plugin/cli.js perf $GITHUB_SHA c7722262e65a3f4d0f1a2d1ad29eccb2069509e4 --tests-branch $GITHUB_SHA --wp-version "$WP_MAJOR"
 
             - name: Compare performance with custom branches
               if: github.event_name == 'workflow_dispatch'
@@ -101,7 +101,7 @@ jobs:
                   CODEHEALTH_PROJECT_TOKEN: ${{ secrets.CODEHEALTH_PROJECT_TOKEN }}
               run: |
                   COMMITTED_AT=$(git show -s $GITHUB_SHA --format="%cI")
-                  ./bin/log-performance-results.js $CODEHEALTH_PROJECT_TOKEN trunk $GITHUB_SHA 5f4c9c853b15092ed885d5280edefb973c37d9e9 $COMMITTED_AT
+                  ./bin/log-performance-results.js $CODEHEALTH_PROJECT_TOKEN trunk $GITHUB_SHA c7722262e65a3f4d0f1a2d1ad29eccb2069509e4 $COMMITTED_AT
 
             - name: Archive debug artifacts (screenshots, HTML snapshots)
               uses: actions/upload-artifact@65462800fd760344b1a7b4382951275a0abb4808 # v4.3.3

gutenberg.php

@@ -3,7 +3,7 @@
  * Plugin Name: Gutenberg
  * Plugin URI: https://github.com/WordPress/gutenberg
  * Description: Printing since 1440. This is the development plugin for the block editor, site editor, and other future WordPress core functionality.
- * Requires at least: 6.5
+ * Requires at least: 6.6
  * Requires PHP: 7.2
  * Version: 19.7.0-rc.2
  * Author: Gutenberg Team
@@ -15,7 +15,7 @@
 ### BEGIN AUTO-GENERATED DEFINES
 defined( 'GUTENBERG_DEVELOPMENT_MODE' ) or define( 'GUTENBERG_DEVELOPMENT_MODE', true );
 ### END AUTO-GENERATED DEFINES
-defined( 'GUTENBERG_MINIMUM_WP_VERSION' ) or define( 'GUTENBERG_MINIMUM_WP_VERSION', '6.5' );
+defined( 'GUTENBERG_MINIMUM_WP_VERSION' ) or define( 'GUTENBERG_MINIMUM_WP_VERSION', '6.6' );
 
 
 gutenberg_pre_init();

lib/block-template-utils.php

@@ -60,7 +60,7 @@ function gutenberg_generate_block_templates_export_file() {
 	}
 
 	// Load templates into the zip file.
-	$templates = gutenberg_get_block_templates();
+	$templates = get_block_templates();
 	foreach ( $templates as $template ) {
 		$template->content = traverse_and_serialize_blocks(
 			parse_blocks( $template->content ),
@@ -74,7 +74,7 @@ function gutenberg_generate_block_templates_export_file() {
 	}
 
 	// Load template parts into the zip file.
-	$template_parts = gutenberg_get_block_templates( array(), 'wp_template_part' );
+	$template_parts = get_block_templates( array(), 'wp_template_part' );
 	foreach ( $template_parts as $template_part ) {
 		$zip->addFromString(
 			'parts/' . $template_part->slug . '.html',

lib/class-wp-theme-json-resolver-gutenberg.php

@@ -316,7 +316,7 @@ public static function get_theme_data( $deprecated = array(), $options = array()
 		 * So we take theme supports, transform it to theme.json shape
 		 * and merge the static::$theme upon that.
 		 */
-		$theme_support_data = WP_Theme_JSON_Gutenberg::get_from_editor_settings( gutenberg_get_classic_theme_supports_block_editor_settings() );
+		$theme_support_data = WP_Theme_JSON_Gutenberg::get_from_editor_settings( get_classic_theme_supports_block_editor_settings() );
 		if ( ! wp_theme_has_theme_json() ) {
 			/*
 			 * Unlike block themes, classic themes without a theme.json disable