PLT-7220: Jumping to a GM from a flagged messages doesn't add the GM to your LHS (#7319)

* Ensured that DM/GM channel is added to LHS when jump link is clicked in RHS

* Moved sidebar channel loading logic into global_actions so that it happens after the users' channels have been loaded

* Fixing checkstyle issues

webapp/actions/global_actions.jsx

@@ -11,7 +11,7 @@ import TeamStore from 'stores/team_store.jsx';
 import SearchStore from 'stores/search_store.jsx';
 
 import {handleNewPost} from 'actions/post_actions.jsx';
-import {loadProfilesForSidebar} from 'actions/user_actions.jsx';
+import {loadProfilesForSidebar, loadNewDMIfNeeded, loadNewGMIfNeeded} from 'actions/user_actions.jsx';
 import {loadChannelsForCurrentUser} from 'actions/channel_actions.jsx';
 import {stopPeriodicStatusUpdates} from 'actions/status_actions.jsx';
 import * as WebsocketActions from 'actions/websocket_actions.jsx';
@@ -133,6 +133,13 @@ export function emitPostFocusEvent(postId, onSuccess) {
         (data) => {
             if (data) {
                 const channelId = data.posts[data.order[0]].channel_id;
+                const channel = ChannelStore.getChannelById(channelId);
+                if (channel && channel.type === Constants.DM_CHANNEL) {
+                    loadNewDMIfNeeded(channel.id);
+                } else if (channel && channel.type === Constants.GM_CHANNEL) {
+                    loadNewGMIfNeeded(channel.id);
+                }
+
                 doFocusPost(channelId, postId, data).then(() => {
                     if (onSuccess) {
                         onSuccess();