add helper method to add ephemeral messages; also switch 'delete message' to this new method

web/react/utils/async_client.jsx

@@ -82,7 +82,7 @@ export function getChannels(checkVersion) {
     );
 }
 
-export function getChannel(id) {
+export function getChannelAndAddUnreadMessages(id, unreadCount) {
     if (isCallInProgress('getChannel' + id)) {
         return;
     }
@@ -97,6 +97,7 @@ export function getChannel(id) {
                 return;
             }
 
+            data.channel.total_msg_count += (unreadCount || 0);
             AppDispatcher.handleServerAction({
                 type: ActionTypes.RECIEVED_CHANNEL,
                 channel: data.channel,
@@ -110,6 +111,10 @@ export function getChannel(id) {
     );
 }
 
+export function getChannel(id) {
+    getChannelAndAddUnreadMessages(id, 0);
+}
+
 export function updateLastViewedAt(id) {
     let channelId;
     if (id) {
@@ -131,6 +136,14 @@ export function updateLastViewedAt(id) {
         channelId,
         () => {
             callTracker.updateLastViewed = 0;
+
+            var channel = ChannelStore.get(channelId);
+            var member = ChannelStore.getMember(channelId);
+            if (channel && member) {
+                member.msg_count = channel.total_msg_count;
+                member.last_viewed_at = utils.getTimestamp();
+                ChannelStore.setChannelMember(member);
+            }
         },
         (err) => {
             callTracker.updateLastViewed = 0;

web/react/utils/utils.jsx

@@ -1254,3 +1254,8 @@ export function isFeatureEnabled(feature) {
 export function isSystemMessage(post) {
     return post.type && (post.type.lastIndexOf(Constants.SYSTEM_MESSAGE_PREFIX) === 0);
 }
+
+// convenience method to dispatch an event in JS' next event cycle
+export function defer(fn) {
+    setTimeout(fn, 0);
+}