Reset divider bar visibility after long pressing on taskbar

Fix: 194164662
Test: enter stage split, long pressing on taskbar and observe
      the divider bar is visible.

Change-Id: I935283dd75442c47d4f3e8421943eea8e0f3cd7f
diff --git a/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java b/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java
index 9180bd0..9f71c07 100644
--- a/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java
+++ b/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java
@@ -1496,6 +1496,8 @@
         boolean wasVisible = mWasLauncherAlreadyVisible || mGestureStarted;
         mActivityInterface.onTransitionCancelled(wasVisible, mGestureState.getEndTarget());
 
+        TaskViewUtils.setDividerBarShown(mRecentsAnimationTargets.nonApps, true);
+
         // Leave the pending invisible flag, as it may be used by wallpaper open animation.
         if (mActivity != null) {
             mActivity.clearForceInvisibleFlag(INVISIBLE_BY_STATE_HANDLER);