Move real-time collaboration code to lib/experimental/collaboration (#80469)

* Move real-time collaboration code to lib/experimental/collaboration

RTC is not part of WordPress 7.1, and whether it lands in a future
release is still undecided. Move the sync/save servers, storage, the
collaboration bootstrap, the RTC autosaves controller and its REST
override, and the RTC meta-box compat out of compat/wordpress-7.1 into
a dedicated experimental/collaboration directory.

The autosaves controller extends WP_REST_Autosaves_Controller, so it
stays inside the class_exists( 'WP_REST_Controller' ) guard; the
meta-box compat moves to the unconditional Experimental features
section.

Co-Authored-By: Claude <noreply@anthropic.com>

* Use 'default' text domain for reused core strings in collaboration row actions

The "Edit &#8220;%s&#8221;" and "Edit" strings reuse WordPress Core
translations, so pass the 'default' text domain explicitly to satisfy
WordPress.WP.I18n.MissingArgDomainDefault and reuse core's existing
translations.

Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: im3dabasia <im3dabasia1@git.wordpress.org>
Co-authored-by: ingeniumed <ingeniumed@git.wordpress.org>

Author: 4 people

lib/compat/wordpress-7.1/rest-api.php

@@ -73,27 +73,3 @@ function gutenberg_override_attachments_rest_controller( $args, $post_type ) {
 	return $args;
 }
 add_filter( 'register_post_type_args', 'gutenberg_override_attachments_rest_controller', 10, 2 );
-
-/**
- * Overrides the default REST controller for autosaves to fix real-time
- * collaboration on draft posts.
- *
- * When RTC is enabled, draft autosaves from all users update the post directly
- * instead of creating per-user autosave revisions depending on post lock and
- * assigned author.
- *
- * Only overrides when autosave_rest_controller_class is not explicitly set,
- * i.e. when WP_REST_Autosaves_Controller would be used by default. Post types
- * with their own specialized autosave controller (e.g. templates) are left alone.
- *
- * @param array $args Array of arguments for registering a post type.
- * @return array Modified array of arguments.
- */
-function gutenberg_override_autosaves_rest_controller( $args ) {
-	if ( empty( $args['autosave_rest_controller_class'] ) ) {
-		$args['autosave_rest_controller_class'] = 'Gutenberg_REST_Autosaves_Controller';
-	}
-	return $args;
-}
-
-add_filter( 'register_post_type_args', 'gutenberg_override_autosaves_rest_controller', 10, 1 );

…-gutenberg-rest-autosaves-controller.php …-gutenberg-rest-autosaves-controller.phplib/compat/wordpress-7.1/class-gutenberg-rest-autosaves-controller.php renamed to lib/experimental/collaboration/class-gutenberg-rest-autosaves-controller.php lib/compat/wordpress-7.1/class-gutenberg-rest-autosaves-controller.php renamed to lib/experimental/collaboration/class-gutenberg-rest-autosaves-controller.php

@@ -580,8 +580,8 @@ function gutenberg_post_list_collaboration_row_actions( $actions, $post ) {
 		. '<span class="join-action-text"><a href="%1$s" aria-label="%4$s">%5$s</a></span>',
 		esc_url( get_edit_post_link( $post->ID ) ),
 		/* translators: %s: Post title. */
-		esc_attr( sprintf( __( 'Edit &#8220;%s&#8221;' ), $title ) ),
-		__( 'Edit' ),
+		esc_attr( sprintf( __( 'Edit &#8220;%s&#8221;', 'default' ), $title ) ),
+		__( 'Edit', 'default' ),
 		/* translators: %s: Post title. */
 		esc_attr( sprintf( __( 'Join editing &#8220;%s&#8221;', 'gutenberg' ), $title ) ),
 		/* translators: Action link text for a singular post in the post list. Can be any type of post. */

….1/class-wp-http-polling-sync-server.php …on/class-wp-http-polling-sync-server.phplib/compat/wordpress-7.1/class-wp-http-polling-sync-server.php renamed to lib/experimental/collaboration/class-wp-http-polling-sync-server.php lib/compat/wordpress-7.1/class-wp-http-polling-sync-server.php renamed to lib/experimental/collaboration/class-wp-http-polling-sync-server.php

@@ -0,0 +1,30 @@
+<?php
+/**
+ * REST API compatibility functions for real-time collaboration.
+ *
+ * @package gutenberg
+ */
+
+/**
+ * Overrides the default REST controller for autosaves to fix real-time
+ * collaboration on draft posts.
+ *
+ * When RTC is enabled, draft autosaves from all users update the post directly
+ * instead of creating per-user autosave revisions depending on post lock and
+ * assigned author.
+ *
+ * Only overrides when autosave_rest_controller_class is not explicitly set,
+ * i.e. when WP_REST_Autosaves_Controller would be used by default. Post types
+ * with their own specialized autosave controller (e.g. templates) are left alone.
+ *
+ * @param array $args Array of arguments for registering a post type.
+ * @return array Modified array of arguments.
+ */
+function gutenberg_override_autosaves_rest_controller( $args ) {
+	if ( empty( $args['autosave_rest_controller_class'] ) ) {
+		$args['autosave_rest_controller_class'] = 'Gutenberg_REST_Autosaves_Controller';
+	}
+	return $args;
+}
+
+add_filter( 'register_post_type_args', 'gutenberg_override_autosaves_rest_controller', 10, 1 );