PLT-4430 improve slow channel switching (#4331)

* PLT-4430 improve slow channel switching

* Update client side unit tests

* Convert getChannelsUnread to getMyChannelMembers and address other feedback

* Pull channel members on websocket reconnect

webapp/actions/global_actions.jsx

@@ -42,8 +42,6 @@ export function emitChannelClickEvent(channel) {
         );
     }
     function switchToChannel(chan) {
-        AsyncClient.getChannels(true);
-        AsyncClient.getMoreChannels(true);
         AsyncClient.getChannelStats(chan.id);
         AsyncClient.updateLastViewedAt(chan.id);
         loadPosts(chan.id);
@@ -436,10 +434,6 @@ export function loadDefaultLocale() {
 }
 
 export function viewLoggedIn() {
-    AsyncClient.getChannels();
-    AsyncClient.getMoreChannels();
-    AsyncClient.getChannelStats();
-
     // Clear pending posts (shouldn't have pending posts if we are loading)
     PostStore.clearPendingPosts();
 }

webapp/actions/post_actions.jsx

@@ -120,7 +120,7 @@ export function setUnreadPost(channelId, postId) {
         member.msg_count = channel.total_msg_count - unreadPosts;
         member.mention_count = 0;
         ChannelStore.storeMyChannelMember(member);
-        ChannelStore.setUnreadCount(channelId);
+        ChannelStore.setUnreadCountByChannel(channelId);
         AsyncClient.setLastViewedAt(lastViewed, channelId);
     }
 

webapp/actions/websocket_actions.jsx

@@ -76,6 +76,7 @@ function handleFirstConnect() {
 function handleReconnect() {
     if (Client.teamId) {
         AsyncClient.getChannels();
+        AsyncClient.getMyChannelMembers();
         loadPosts(ChannelStore.getCurrentId());
     }