Merge "Fix multi user crash when Add guest was tapped multiple times" into rvc-dev am: 15d9351ba0 am: 850263d0c6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/12108073

Change-Id: I20cc9c95340b76f81ab6c207ad0dcc2fcbf1d3eb

src/com/android/settings/users/UserSettings.java

@@ -1064,6 +1064,7 @@ public class UserSettings extends SettingsPreferenceFragment
             }
             return true;
         } else if (pref == mAddGuest) {
+            mAddGuest.setEnabled(false); // prevent multiple tap issue
             UserInfo guest = mUserManager.createGuest(
                     getContext(), getString(com.android.settingslib.R.string.user_guest));
             openUserDetails(guest, true);