#1 - Change Hostname on logout - added comments

app/src/main/java/chat/rocket/android/fragment/sidebar/SidebarMainFragment.java

@@ -268,6 +268,7 @@ public class SidebarMainFragment extends AbstractFragment implements SidebarMain
     rootView.findViewById(R.id.btn_logout).setOnClickListener(view -> {
       presenter.onLogout();
       closeUserActionContainer();
+      //go back to the AddServerActivity
       LaunchUtil.showAddServerActivity(getContext());
     });
   }

app/src/main/java/chat/rocket/android/service/RealmBasedConnectivityManager.java

@@ -239,6 +239,7 @@ import rx.subjects.PublishSubject;
 
       if (serviceInterface != null) {
         return serviceInterface.disconnectFromServer(hostname)
+                // //after disconnection from server, remove HOSTNAME key from HashMap
                 .doAfterTerminate(() -> serverConnectivityList.remove(hostname));
       } else {
         return Single.error(new IllegalStateException("not prepared"));