close post control button after reacting to a post (#7110)

webapp/components/post_view/post_info/post_info.jsx

@@ -125,6 +125,7 @@ export default class PostInfo extends React.PureComponent {
         const emojiName = emoji.name || emoji.aliases[0];
         this.props.actions.addReaction(this.props.post.id, emojiName);
         emitEmojiPosted(emojiName);
+        this.props.handleDropdownOpened(false);
     }
 
     getDotMenu = () => {

webapp/components/rhs_comment.jsx

@@ -166,6 +166,7 @@ export default class RhsComment extends React.Component {
         this.setState({showEmojiPicker: false});
         const emojiName = emoji.name || emoji.aliases[0];
         addReaction(this.props.post.channel_id, this.props.post.id, emojiName);
+        this.handleDropdownOpened(false);
     }
 
     getClassName = (post, isSystemMessage) => {

webapp/components/rhs_root_post.jsx

@@ -159,6 +159,7 @@ export default class RhsRootPost extends React.Component {
         this.setState({showEmojiPicker: false});
         const emojiName = emoji.name || emoji.aliases[0];
         addReaction(this.props.post.channel_id, this.props.post.id, emojiName);
+        this.handleDropdownOpened(false);
     }
 
     getClassName = (post, isSystemMessage) => {