Fix race causing channels to not clear mention on focus (#6587)

webapp/components/needs_team/needs_team.jsx

@@ -119,12 +119,12 @@ export default class NeedsTeam extends React.Component {
 
         // Set up tracking for whether the window is active
         window.isActive = true;
-        $(window).on('focus', () => {
-            this.props.actions.viewChannel(ChannelStore.getCurrentId());
+        $(window).on('focus', async () => {
             ChannelStore.resetCounts([ChannelStore.getCurrentId()]);
             ChannelStore.emitChange();
-
             window.isActive = true;
+
+            await this.props.actions.viewChannel(ChannelStore.getCurrentId());
             if (new Date().getTime() - this.blurTime > UNREAD_CHECK_TIME_MILLISECONDS) {
                 this.props.actions.getMyChannelMembers(TeamStore.getCurrentId()).then(loadProfilesForSidebar);
             }