PLT-5396 Fix team mention badge persistance (#5543)

webapp/actions/global_actions.jsx

@@ -55,6 +55,10 @@ export function emitChannelClickEvent(channel) {
             loadPosts(chan.id);
         });
 
+        // Subtract mentions for the team
+        const {msgs, mentions} = ChannelStore.getUnreadCounts()[chan.id] || {msgs: 0, mentions: 0};
+        TeamStore.subtractUnread(chan.team_id, msgs, mentions);
+
         // Mark previous and next channel as read
         ChannelStore.resetCounts(oldChannelId);
         ChannelStore.resetCounts(chan.id);

webapp/stores/team_store.jsx

@@ -321,6 +321,14 @@ class TeamStoreClass extends EventEmitter {
         }
     }
 
+    subtractUnread(teamId, msgs, mentions) {
+        const member = this.my_team_members.filter((m) => m.team_id === teamId)[0];
+        if (member) {
+            member.msg_count -= msgs;
+            member.mention_count -= mentions;
+        }
+    }
+
     incrementMessages(id, channelId) {
         const channelMember = ChannelStore.getMyMember(channelId);
         if (channelMember && channelMember.notify_props && channelMember.notify_props.mark_unread === NotificationPrefs.MENTION) {