Merge "Do not create highlight if track width is invalid" into pi-dev

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

@@ -501,6 +501,9 @@ public class QuickStepController implements GestureHelper {
     }
 
     private void updateHighlight() {
+        if (mTrackRect.isEmpty()) {
+            return;
+        }
         int colorBase, colorGrad;
         if (mDarkIntensity > 0.5f) {
             colorBase = mContext.getColor(R.color.quick_step_track_background_background_dark);