Suspend calling wp_cache_set_posts_last_changed() when touching post meta in WP_Sync_Post_Meta_Storage

src/wp-includes/collaboration/class-wp-sync-post-meta-storage.php

@@ -85,7 +85,9 @@ public function add_update( string $room, $update ): bool {
 			'value'     => $update,
 		);
 
-		return (bool) add_post_meta( $post_id, self::SYNC_UPDATE_META_KEY, $envelope, false );
+		return $this->with_suspended_posts_last_changed_update(
+			fn() => (bool) add_post_meta( $post_id, self::SYNC_UPDATE_META_KEY, $envelope, false )
+		);
 	}
 
 	/**
@@ -162,7 +164,9 @@ public function set_awareness_state( string $room, array $awareness ): bool {
 		}
 
 		// update_post_meta returns false if the value is the same as the existing value.
-		update_post_meta( $post_id, self::AWARENESS_META_KEY, $awareness );
+		$this->with_suspended_posts_last_changed_update(
+			fn() => update_post_meta( $post_id, self::AWARENESS_META_KEY, $awareness )
+		);
 		return true;
 	}
 
@@ -305,18 +309,50 @@ public function remove_updates_before_cursor( string $room, int $cursor ): bool
 		$all_updates = $this->get_all_updates( $room );
 
 		// Remove all updates for the room and re-store only those that are newer than the cursor.
-		if ( ! delete_post_meta( $post_id, self::SYNC_UPDATE_META_KEY ) ) {
+		if ( ! $this->with_suspended_posts_last_changed_update( fn() => delete_post_meta( $post_id, self::SYNC_UPDATE_META_KEY ) ) ) {
 			return false;
 		}
 
 		// Re-store envelopes directly to avoid double-wrapping by add_update().
 		$add_result = true;
 		foreach ( $all_updates as $envelope ) {
 			if ( $add_result && $envelope['timestamp'] >= $cursor ) {
-				$add_result = (bool) add_post_meta( $post_id, self::SYNC_UPDATE_META_KEY, $envelope, false );
+				$add_result = $this->with_suspended_posts_last_changed_update(
+					fn() => (bool) add_post_meta( $post_id, self::SYNC_UPDATE_META_KEY, $envelope, false )
+				);
 			}
 		}
 
 		return $add_result;
 	}
+
+	/**
+	 * Invokes the provided callback while the suspending setting the posts last_changed cache key.
+	 *
+	 * @since 7.0.0
+	 * @see wp_cache_set_posts_last_changed()
+	 *
+	 * @template T
+	 * @param Closure(): T $callback Callback.
+	 * @return T Return value from the callback.
+	 */
+	private function with_suspended_posts_last_changed_update( Closure $callback ) {
+		$priorities = array(
+			'added_post_meta'   => has_action( 'added_post_meta', 'wp_cache_set_posts_last_changed' ),
+			'updated_post_meta' => has_action( 'updated_post_meta', 'wp_cache_set_posts_last_changed' ),
+			'deleted_post_meta' => has_action( 'deleted_post_meta', 'wp_cache_set_posts_last_changed' ),
+		);
+		foreach ( $priorities as $action => $priority ) {
+			if ( false !== $priority ) {
+				remove_action( $action, 'wp_cache_set_posts_last_changed', $priority );
+			}
+		}
+		$return_value = $callback();
+		foreach ( $priorities as $action => $priority ) {
+			if ( false !== $priority ) {
+				add_action( $action, 'wp_cache_set_posts_last_changed', $priority );
+			}
+		}
+		return $return_value;
+	}
 }