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

quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java

@@ -1392,6 +1392,10 @@ public abstract class AbsSwipeUpHandler<T extends StatefulActivity<S>,
             mLauncherTransitionController.getNormalController().getAnimationPlayer().end();
             mLauncherTransitionController = null;
         }
+
+        if (mRecentsView != null) {
+            mRecentsView.abortScrollerAnimation();
+        }
     }
 
     /**
@@ -1410,7 +1414,7 @@ public abstract class AbsSwipeUpHandler<T extends StatefulActivity<S>,
 
     private void resetStateForAnimationCancel() {
         boolean wasVisible = mWasLauncherAlreadyVisible || mGestureStarted;
-        mActivityInterface.onTransitionCancelled(wasVisible);
+        mActivityInterface.onTransitionCancelled(wasVisible, mGestureState.getEndTarget());
 
         // Leave the pending invisible flag, as it may be used by wallpaper open animation.
         if (mActivity != null) {

quickstep/src/com/android/quickstep/BaseActivityInterface.java

@@ -86,12 +86,22 @@ public abstract class BaseActivityInterface<STATE_TYPE extends BaseState<STATE_T
         mBackgroundState = backgroundState;
     }
 
-    public void onTransitionCancelled(boolean activityVisible) {
+    /**
+     * Called when the current gesture transition is cancelled.
+     * @param activityVisible Whether the user can see the changes we make here, so try to animate.
+     * @param endTarget If the gesture ended before we got cancelled, where we were headed.
+     */
+    public void onTransitionCancelled(boolean activityVisible,
+            @Nullable GestureState.GestureEndTarget endTarget) {
         ACTIVITY_TYPE activity = getCreatedActivity();
         if (activity == null) {
             return;
         }
         STATE_TYPE startState = activity.getStateManager().getRestState();
+        if (endTarget != null) {
+            // We were on our way to this state when we got canceled, end there instead.
+            startState = stateFromGestureEndTarget(endTarget);
+        }
         activity.getStateManager().goToState(startState, activityVisible);
     }
 

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