Install plugin: polylang.

Name: Polylang
Version: 3.6.5

See #3450.

wp-content/plugins/polylang/admin/admin-block-editor.php

@@ -0,0 +1,92 @@
+<?php
+/**
+ * @package Polylang
+ */
+
+/**
+ * Manages filters and actions related to the block editor
+ *
+ * @since 2.5
+ */
+class PLL_Admin_Block_Editor {
+	/**
+	 * @var PLL_Model
+	 */
+	protected $model;
+
+	/**
+	 * @var PLL_Filter_REST_Routes
+	 */
+	public $filter_rest_routes;
+
+	/**
+	 * Constructor: setups filters and actions.
+	 *
+	 * @since 2.5
+	 *
+	 * @param PLL_Admin $polylang The Polylang object.
+	 */
+	public function __construct( &$polylang ) {
+		$this->model              = &$polylang->model;
+		$this->filter_rest_routes = new PLL_Filter_REST_Routes( $polylang->model );
+
+		add_filter( 'block_editor_rest_api_preload_paths', array( $this, 'filter_preload_paths' ), 50, 2 );
+		add_action( 'admin_enqueue_scripts', array( $this, 'add_block_editor_inline_script' ), 15 ); // After `PLL_Admin_Base::admin_enqueue_scripts()` to ensure `pll_block-editor`script is enqueued.
+	}
+
+	/**
+	 * Filters preload paths based on the context (block editor for posts, site editor or widget editor for instance).
+	 *
+	 * @since 3.5
+	 *
+	 * @param array                   $preload_paths Preload paths.
+	 * @param WP_Block_Editor_Context $context       Editor context.
+	 * @return array Filtered preload paths.
+	 */
+	public function filter_preload_paths( $preload_paths, $context ) {
+		if ( ! $context instanceof WP_Block_Editor_Context ) {
+			return $preload_paths;
+		}
+
+		// Backward compatibility with WP < 6.0 where `WP_Block_Editor_Context::$name` doesn't exist yet.
+		if (
+			( property_exists( $context, 'name' ) && 'core/edit-post' !== $context->name )
+			|| ! $context->post instanceof WP_Post
+		) {
+			// Do nothing if not post editor.
+			return $preload_paths;
+		}
+
+		if ( ! $this->model->is_translated_post_type( $context->post->post_type ) ) {
+			return $preload_paths;
+		}
+
+		$language = $this->model->post->get_language( $context->post->ID );
+
+		if ( empty( $language ) ) {
+			return $preload_paths;
+		}
+
+		return $this->filter_rest_routes->add_query_parameters(
+			$preload_paths,
+			array(
+				'lang' => $language->slug,
+			)
+		);
+	}
+
+	/**
+	 * Adds inline block editor script for filterable REST routes.
+	 *
+	 * @since 3.5
+	 *
+	 * @return void
+	 */
+	public function add_block_editor_inline_script() {
+		$handle = 'pll_block-editor';
+
+		if ( wp_script_is( $handle, 'enqueued' ) ) {
+			$this->filter_rest_routes->add_inline_script( $handle );
+		}
+	}
+}