PLT-3077 Add group messaging (#5489)

* Implement server changes for group messaging

* Majority of client-side implementation

* Some server updates

* Added new React multiselect component

* Fix style issues

* Add custom renderer for options

* Fix model test

* Update ENTER functionality for multiselect control

* Remove buttons from multiselect UI control

* Updating group messaging UI (#5524)

* Move filter controls up a component level

* Scroll with arrow keys

* Updating mobile layout for multiselect (#5534)

* Fix race condition when backspacing quickly

* Hidden or new GMs show up for regular messages

* Add overriding of number remaining text

* Add UI filtering for team if config setting set

* Add icon to channel switcher and class prop to status icon

* Minor updates per feedback

* Improving group messaging UI (#5563)

* UX changes per feedback

* Update email for group messages

* UI fixes for group messaging (#5587)

* Fix missing localization string

* Add maximum users message when adding members to GM

* Fix input clearing on Android

* Updating group messaging UI (#5603)

* Updating UI for group messaging (#5604)

webapp/routes/route_team.jsx

@@ -21,7 +21,7 @@ import BrowserStore from 'stores/browser_store.jsx';
 import emojiRoute from 'routes/route_emoji.jsx';
 import integrationsRoute from 'routes/route_integrations.jsx';
 
-import {loadNewDMIfNeeded, loadProfilesAndTeamMembersForDMSidebar} from 'actions/user_actions.jsx';
+import {loadNewDMIfNeeded, loadNewGMIfNeeded, loadProfilesForSidebar} from 'actions/user_actions.jsx';
 
 function onChannelEnter(nextState, replace, callback) {
     doChannelChange(nextState, replace, callback);
@@ -36,6 +36,8 @@ function doChannelChange(state, replace, callback) {
 
         if (channel && channel.type === Constants.DM_CHANNEL) {
             loadNewDMIfNeeded(Utils.getUserIdFromChannelName(channel));
+        } else if (channel && channel.type === Constants.GM_CHANNEL) {
+            loadNewGMIfNeeded(channel.id);
         }
 
         if (!channel) {
@@ -120,7 +122,7 @@ function preNeedsTeam(nextState, replace, callback) {
             });
 
             loadStatusesForChannelAndSidebar();
-            loadProfilesAndTeamMembersForDMSidebar();
+            loadProfilesForSidebar();
 
             d1.resolve();
         },