Fix Flicker of inner corners in split screen when quick switching to

Update divider bar visibility immediately when quick switching to split
pair

Fix: 234609814
Test: manual check quick switch with split pair
Change-Id: I4fc36302763bc0a7de9caca0ab370e3cedc18076
diff --git a/quickstep/src/com/android/quickstep/TaskAnimationManager.java b/quickstep/src/com/android/quickstep/TaskAnimationManager.java
index 54f457d..fd7e367 100644
--- a/quickstep/src/com/android/quickstep/TaskAnimationManager.java
+++ b/quickstep/src/com/android/quickstep/TaskAnimationManager.java
@@ -195,7 +195,10 @@
                 } else if (nonAppTargets != null && nonAppTargets.length > 0) {
                     TaskViewUtils.createSplitAuxiliarySurfacesAnimator(
                             RemoteAnimationTargetCompat.wrap(nonAppTargets) /* nonApps */,
-                            true /*shown*/, dividerAnimator -> dividerAnimator.start());
+                            true /*shown*/, dividerAnimator -> {
+                                dividerAnimator.start();
+                                dividerAnimator.end();
+                            });
                 }
                 if (mController != null) {
                     if (mLastAppearedTaskTarget == null