Multiple UI Improvements

web/react/components/rhs_root_post.jsx

@@ -227,7 +227,6 @@ export default class RhsRootPost extends React.Component {
                         </div>
                     </div>
                 </div>
-                <hr />
             </div>
         );
     }

web/react/components/settings_sidebar.jsx

@@ -1,6 +1,8 @@
 // Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
 
+import * as Utils from '../utils/utils.jsx';
+
 export default class SettingsSidebar extends React.Component {
     componentDidUpdate() {
         $('.settings-modal').find('.modal-body').scrollTop(0);
@@ -16,6 +18,11 @@ export default class SettingsSidebar extends React.Component {
         this.props.updateTab(tab.name);
         $(e.target).closest('.settings-modal').addClass('display--content');
     }
+    componentDidMount() {
+        if (Utils.isBrowserFirefox()) {
+            $('.settings-modal .settings-table .nav').addClass('position--top');
+        }
+    }
     render() {
         let tabList = this.props.tabs.map(function makeTab(tab) {
             let key = `${tab.name}_li`;

web/react/components/suggestion/search_channel_provider.jsx

@@ -19,7 +19,7 @@ class SearchChannelSuggestion extends React.Component {
                 onClick={onClick}
                 className={className}
             >
-                {item.name}
+                <i className='fa fa fa-plus-square'></i>{item.name}
             </div>
         );
     }

web/react/components/suggestion/search_user_provider.jsx

@@ -22,7 +22,7 @@ class SearchUserSuggestion extends React.Component {
                     className='profile-img rounded'
                     src={'/api/v1/users/' + item.id + '/image?time=' + item.update_at}
                 />
-                {item.username}
+                <i className='fa fa fa-plus-square'></i>{item.username}
             </div>
         );
     }

web/react/components/user_settings/custom_theme_chooser.jsx

@@ -104,7 +104,7 @@ export default class CustomThemeChooser extends React.Component {
                     >
                         <label className='custom-label'>{element.uiName}</label>
                         <div
-                            className='input-group theme-group dropdown'
+                            className='input-group theme-group group--code dropdown'
                             id={element.id}
                         >
                             <select