Fixed bug w/ ConfirmLock error text flickering

Test: Manually verified that the patterns text does not get
set to the empty string.
Fixes: 301214189

Change-Id: I768c9693b6be28a4cabaadc404465a172e2e5564

src/com/android/settings/password/ConfirmDeviceCredentialBaseFragment.java

@@ -419,6 +419,10 @@ public abstract class ConfirmDeviceCredentialBaseFragment extends InstrumentedFr
         }
     }
 
+    protected void clearResetErrorRunnable() {
+        mHandler.removeCallbacks(mResetErrorRunnable);
+    }
+
     protected void validateGuess(LockscreenCredential credentialGuess) {
         mRemoteLockscreenValidationFragment.validateLockscreenGuess(
                 mRemoteLockscreenValidationClient, credentialGuess,

src/com/android/settings/password/ConfirmLockPassword.java

@@ -666,6 +666,7 @@ public class ConfirmLockPassword extends ConfirmDeviceCredentialBaseActivity {
         }
 
         private void handleAttemptLockout(long elapsedRealtimeDeadline) {
+            clearResetErrorRunnable();
             mCountdownTimer = new CountDownTimer(
                     elapsedRealtimeDeadline - SystemClock.elapsedRealtime(),
                     LockPatternUtils.FAILED_ATTEMPT_COUNTDOWN_INTERVAL_MS) {

src/com/android/settings/password/ConfirmLockPattern.java

@@ -697,6 +697,7 @@ public class ConfirmLockPattern extends ConfirmDeviceCredentialBaseActivity {
         }
 
         private void handleAttemptLockout(long elapsedRealtimeDeadline) {
+            clearResetErrorRunnable();
             updateStage(Stage.LockedOut);
             long elapsedRealtime = SystemClock.elapsedRealtime();
             mCountdownTimer = new CountDownTimer(