Add ability to swipe from apps to widgets in AllAppsCustomize (issue 5453016)

Change-Id: I4d725cf1ee11d67f5149dbd0edbcb2e0af3b80ee

src/com/android/launcher2/PagedView.java

@@ -1685,6 +1685,10 @@ public abstract class PagedView extends ViewGroup {
         }
 
         if (mContentIsRefreshable) {
+            // Force all scrolling-related behavior to end
+            mScroller.forceFinished(true);
+            mNextPage = INVALID_PAGE;
+
             // Update all the pages
             syncPages();