Fix new DMs not showing up in the sidebar (#4374)

webapp/actions/global_actions.jsx

@@ -360,14 +360,14 @@ export function emitClearSuggestions(suggestionId) {
 }
 
 export function emitPreferenceChangedEvent(preference) {
-    if (preference.category === Constants.Preferences.CATEGORY_DIRECT_CHANNEL_SHOW) {
-        loadProfilesAndTeamMembersForDMSidebar();
-    }
-
     AppDispatcher.handleServerAction({
         type: Constants.ActionTypes.RECEIVED_PREFERENCE,
         preference
     });
+
+    if (preference.category === Constants.Preferences.CATEGORY_DIRECT_CHANNEL_SHOW) {
+        loadProfilesAndTeamMembersForDMSidebar();
+    }
 }
 
 export function emitRemovePost(post) {

webapp/utils/channel_utils.jsx

@@ -35,7 +35,7 @@ export function buildDisplayableChannelList(persistentChannels) {
         publicChannels: notFavoriteChannels.filter(isOpenChannel),
         privateChannels: notFavoriteChannels.filter(isPrivateChannel),
         directChannels: directChannels.filter(isConnectedToTeamMember),
-        directNonTeamChannels: directChannels.filter(not(isConnectedToTeamMember))
+        directNonTeamChannels: directChannels.filter(isNotConnectedToTeamMember)
     };
 }
 
@@ -119,6 +119,10 @@ function isTeamMember(userId) {
     return TeamStore.hasActiveMemberInTeam(TeamStore.getCurrentId(), userId);
 }
 
+function isNotConnectedToTeamMember(channel) {
+    return TeamStore.hasMemberNotInTeam(TeamStore.getCurrentId(), channel.teammate_id);
+}
+
 function not(f) {
     return (...args) => !f(...args);
 }