Feature: Implemented debounced mechanism for requesting a mention feed.

Closes ckeditor/ckeditor5#4619.

package.json

@@ -13,7 +13,8 @@
     "@ckeditor/ckeditor5-core": "^16.0.0",
     "@ckeditor/ckeditor5-ui": "^16.0.0",
     "@ckeditor/ckeditor5-typing": "^16.0.0",
-    "@ckeditor/ckeditor5-utils": "^16.0.0"
+    "@ckeditor/ckeditor5-utils": "^16.0.0",
+    "lodash-es": "^4.17.10"
   },
   "devDependencies": {
     "@ckeditor/ckeditor5-basic-styles": "^16.0.0",
@@ -31,6 +32,7 @@
     "eslint-config-ckeditor5": "^2.0.0",
     "husky": "^1.3.1",
     "lint-staged": "^7.0.0",
+    "lodash": "^4.17.11",
     "stylelint": "^11.1.1",
     "stylelint-config-ckeditor5": "^1.0.0"
   },

src/mentionediting.js

@@ -81,7 +81,7 @@ export function _addMentionAttributes( baseMentionData, data ) {
  * @protected
  * @param {module:engine/view/element~Element} viewElementOrMention
  * @param {String|Object} [data] Mention data to be extended.
- * @return {module:mention/mention~MentionAttribute}
+ * @returns {module:mention/mention~MentionAttribute}
  */
 export function _toMentionAttribute( viewElementOrMention, data ) {
 	const dataMention = viewElementOrMention.getAttribute( 'data-mention' );