Fix disappearing nav icons. (DO NOT MERGE)

Bug: 5328284
Change-Id: Iaa20454cff9f5a340da7b0c71190796445e8a205

Author: dsandler

packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java

@@ -143,18 +143,26 @@ public void setLowProfile(final boolean lightsOut, final boolean animate, final
         final View navButtons = mCurrentView.findViewById(R.id.nav_buttons);
         final View lowLights = mCurrentView.findViewById(R.id.lights_out);
 
+        // ok, everyone, stop it right there
+        navButtons.animate().cancel();
+        lowLights.animate().cancel();
+
         if (!animate) {
-            lowLights.setVisibility(View.GONE);
-            navButtons.setAlpha(1f);
+            navButtons.setAlpha(lightsOut ? 0f : 1f);
+
+            lowLights.setAlpha(lightsOut ? 1f : 0f);
+            lowLights.setVisibility(lightsOut ? View.VISIBLE : View.GONE);
         } else {
             navButtons.animate()
                 .alpha(lightsOut ? 0f : 1f)
                 .setDuration(lightsOut ? 600 : 200)
                 .start();
 
             lowLights.setOnTouchListener(mLightsOutListener);
-            lowLights.setAlpha(0f);
-            lowLights.setVisibility(View.VISIBLE);
+            if (lowLights.getVisibility() == View.GONE) {
+                lowLights.setAlpha(0f);
+                lowLights.setVisibility(View.VISIBLE);
+            }
             lowLights.animate()
                 .alpha(lightsOut ? 1f : 0f)
                 .setStartDelay(lightsOut ? 500 : 0)