Disabling fast scroller when searching apps.

- There is no meaningful order for the app search results since they are ranked.

Bug: 23759082
Change-Id: I0aa4eea68136ea3ecef2a80b20ba7b0d46f0653b
diff --git a/src/com/android/launcher3/BaseRecyclerViewFastScrollBar.java b/src/com/android/launcher3/BaseRecyclerViewFastScrollBar.java
index fcee7e8..32ea576 100644
--- a/src/com/android/launcher3/BaseRecyclerViewFastScrollBar.java
+++ b/src/com/android/launcher3/BaseRecyclerViewFastScrollBar.java
@@ -189,7 +189,8 @@
                 // Check if we should start scrolling, but ignore this fastscroll gesture if we have
                 // exceeded some fixed movement
                 mIgnoreDragGesture |= Math.abs(y - downY) > config.getScaledPagingTouchSlop();
-                if (!mIsDragging && !mIgnoreDragGesture && isNearThumb(downX, lastY) &&
+                if (!mIsDragging && !mIgnoreDragGesture && mRv.supportsFastScrolling() &&
+                        isNearThumb(downX, lastY) &&
                         Math.abs(y - downY) > config.getScaledTouchSlop()) {
                     mRv.getParent().requestDisallowInterceptTouchEvent(true);
                     mIsDragging = true;