[Glitch] Highlight active tab in action bar

Port 7b7c26063e to glitch-soc

app/javascript/flavours/glitch/features/account/components/action_bar.js

@@ -2,7 +2,7 @@ import React from 'react';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import PropTypes from 'prop-types';
 import DropdownMenuContainer from 'flavours/glitch/containers/dropdown_menu_container';
-import { Link } from 'react-router-dom';
+import { NavLink } from 'react-router-dom';
 import { defineMessages, injectIntl, FormattedMessage, FormattedNumber } from 'react-intl';
 import { me, isStaff } from 'flavours/glitch/util/initial_state';
 
@@ -136,20 +136,20 @@ export default class ActionBar extends React.PureComponent {
           </div>
 
           <div className='account__action-bar-links'>
-            <Link className='account__action-bar__tab' to={`/accounts/${account.get('id')}`}>
+            <NavLink exact activeClassName='active' className='account__action-bar__tab' to={`/accounts/${account.get('id')}`}>
               <FormattedMessage id='account.posts' defaultMessage='Posts' />
               <strong><FormattedNumber value={account.get('statuses_count')} /></strong>
-            </Link>
+            </NavLink>
 
-            <Link className='account__action-bar__tab' to={`/accounts/${account.get('id')}/following`}>
+            <NavLink exact activeClassName='active' className='account__action-bar__tab' to={`/accounts/${account.get('id')}/following`}>
               <FormattedMessage id='account.follows' defaultMessage='Follows' />
               <strong><FormattedNumber value={account.get('following_count')} /></strong>
-            </Link>
+            </NavLink>
 
-            <Link className='account__action-bar__tab' to={`/accounts/${account.get('id')}/followers`}>
+            <NavLink exact activeClassName='active' className='account__action-bar__tab' to={`/accounts/${account.get('id')}/followers`}>
               <FormattedMessage id='account.followers' defaultMessage='Followers' />
               <strong><FormattedNumber value={account.get('followers_count')} /></strong>
-            </Link>
+            </NavLink>
           </div>
         </div>
       </div>

app/javascript/flavours/glitch/styles/components/accounts.scss

@@ -239,6 +239,11 @@
   flex: 0 1 100%;
   border-left: 1px solid lighten($ui-base-color, 8%);
   padding: 10px 0;
+  border-bottom: 4px solid transparent;
+
+  &.active {
+    border-bottom: 4px solid $ui-highlight-color;
+  }
 
   & > span {
     display: block;