Clear and re-focus pin password entry field

Under certain conditions, this field can enter an unpredictable state
where it's not focused but the request focus call fails because the
focus flag is set. By clearing the focus before re-requesting, a fully
focused state can be guaranteed.

Bug: 263440452
Test: atest android.appsecurity.cts.DirectBootHostTest#testDirectBootNative
Change-Id: Ib8f0de99abbf99cdbed4c3228c44ee3db105f952

packages/SystemUI/src/com/android/keyguard/KeyguardPinBasedInputViewController.java

@@ -127,6 +127,11 @@ public abstract class KeyguardPinBasedInputViewController<T extends KeyguardPinB
     @Override
     public void onResume(int reason) {
         super.onResume(reason);
+        // It's possible to reach a state here where mPasswordEntry believes it is focused
+        // but it is not actually focused. This state will prevent the view from gaining focus,
+        // as requestFocus will no-op since the focus flag is already set. By clearing focus first,
+        // it's guaranteed that the view has focus.
+        mPasswordEntry.clearFocus();
         mPasswordEntry.requestFocus();
     }