Fix JS error when hovering over reactions (#6710)

* Fix JS error when hovering over reactions

* Fix autocomplete for custom emojis

* Update to latest mattermost-redux

webapp/components/post_view/reaction/reaction.jsx

@@ -41,6 +41,11 @@ export default class Reaction extends React.PureComponent {
          */
         otherUsersCount: PropTypes.number.isRequired,
 
+        /*
+         * Array of reactions by user
+         */
+        reactions: PropTypes.arrayOf(PropTypes.object).isRequired,
+
         /*
          * The URL of the emoji image
          */
@@ -82,6 +87,11 @@ export default class Reaction extends React.PureComponent {
         this.props.actions.removeReaction(this.props.post.id, this.props.emojiName);
     }
 
+    loadMissingProfiles = () => {
+        const ids = this.props.reactions.map((reaction) => reaction.user_id);
+        this.props.actions.getMissingProfilesByIds(ids);
+    }
+
     render() {
         let currentUserReacted = false;
         const users = [];
@@ -219,7 +229,7 @@ export default class Reaction extends React.PureComponent {
                         {clickTooltip}
                     </Tooltip>
                 }
-                onEnter={this.props.actions.getMissingProfilesByIds}
+                onEnter={this.loadMissingProfiles}
             >
                 <div
                     className={className}