Cleanup state properly when interacting during gesture nav transition

When the transition is canceled (e.g. when touching the nav bar during the transition), do the following:
- Abort the RecentsView scroll including the edge effects to ensure we get onSettledOnEndTarget() immediately.
- Jump to the current gesture end target state instead of the default rest state.

Test: Swipe up and to the left and hold to go to overview from an app, then swipe up to home during the transition; ensure that the touch down goes to overview rather than home, and subsequently that the swipe is respected and goes to home
Fixes: 189142339
Change-Id: Ie1d7dd05f45ab48968df7fdfd69fa1e1dda36d06

src/com/android/launcher3/PagedView.java

@@ -250,6 +250,15 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         forceFinishScroller(true);
     }
 
+    /**
+     *  Immediately finishes any overscroll effect and jumps to the end of the scroller animation.
+     */
+    public void abortScrollerAnimation() {
+        mEdgeGlowLeft.finish();
+        mEdgeGlowRight.finish();
+        abortScrollerAnimation(true);
+    }
+
     private void abortScrollerAnimation(boolean resetNextPage) {
         mScroller.abortAnimation();
         // We need to clean up the next page here to avoid computeScrollHelper from