Don't re-hide the keyguard if it isn't showing.

This has a horrifying and unpredictable side effect of triggering
post-unlock Runnables that are stored in StatusBar.java, which can
result in a blank screen on unlock in certain race conditions.

Test: unlock, launch an app during the unlock animation, press power, wake up at bad time
Test: I wrote a custom build to force the above scenario to verify this works
Fixes: 214647311
Change-Id: I00655c2e85c46bd0c52b77094757e155b1a6f9c9

packages/SystemUI/src/com/android/systemui/keyguard/KeyguardUnlockAnimationController.kt

@@ -23,6 +23,7 @@ import android.content.Context
 import android.graphics.Matrix
 import android.graphics.Rect
 import android.os.Handler
+import android.util.Log
 import android.view.RemoteAnimationTarget
 import android.view.SyncRtSurfaceTransactionApplier
 import android.view.View
@@ -47,6 +48,8 @@ import dagger.Lazy
 import javax.inject.Inject
 import kotlin.math.min
 
+const val TAG = "KeyguardUnlock"
+
 /**
  * Starting scale factor for the app/launcher surface behind the keyguard, when it's animating
  * in during keyguard exit.
@@ -584,8 +587,16 @@ class KeyguardUnlockAnimationController @Inject constructor(
      * animation.
      */
     fun hideKeyguardViewAfterRemoteAnimation() {
+        if (keyguardViewController.isShowing) {
             // Hide the keyguard, with no fade out since we animated it away during the unlock.
-        keyguardViewController.hide(surfaceBehindRemoteAnimationStartTime, 0 /* fadeOutDuration */)
+            keyguardViewController.hide(
+                surfaceBehindRemoteAnimationStartTime,
+                0 /* fadeOutDuration */
+            )
+        } else {
+            Log.e(TAG, "#hideKeyguardViewAfterRemoteAnimation called when keyguard view is not " +
+                    "showing. Ignoring...")
+        }
     }
 
     private fun applyParamsToSurface(params: SyncRtSurfaceTransactionApplier.SurfaceParams) {