Workspace should not receive touch events

Bug: 234648831
Test: touch outside recycler view inside container, doesn't swipe left/right

TL;DR;;
As the definition of ActiveRecyclerView changed in latest refactor,
scrollbar existence is no longer a condition to consume
touch event if user is in isSearching state.

Change-Id: Iec97fb036ad45796a77c59d35f329744398d4953

src/com/android/launcher3/allapps/BaseAllAppsContainerView.java

@@ -301,6 +301,10 @@ public abstract class BaseAllAppsContainerView<T extends Context & ActivityConte
             mTouchHandler.handleTouchEvent(ev, mFastScrollerOffset);
             return true;
         }
+        if (isSearching()) {
+            // if in search state, consume touch event.
+            return true;
+        }
         return false;
     }