[Search][Layout] Fix blank space when predictions are disabled

This regression is caused due to getExpectedHeight relying on view visibility state while AlphaUpdateListener.updateVisibility was reseting the views visibility.

Bug: 184211402
Test: local
Change-Id: Ib756f5eb8f6356a18a025626008b97fd7c77fec9

quickstep/src/com/android/launcher3/appprediction/PredictionRowView.java

@@ -237,7 +237,9 @@ public class PredictionRowView extends LinearLayout implements
             setTranslationY(scroll);
         }
         setAlpha(mScrolledOut ? 0 : 1);
-        AlphaUpdateListener.updateVisibility(this);
+        if (getVisibility() != GONE) {
+            AlphaUpdateListener.updateVisibility(this);
+        }
     }
 
     @Override