Polish ActivityEmbedding Shell animation when open a split pair

Before, we are checking TransitionInfo.isIndependent, which is true when
the parent is TRANSIT_CHANGE. However, we already animate the change
parent here, so we should skip the child for such case.

Bug: 207070762
Test: manually verify the animation
Change-Id: I3d1342ef27c97b2c8bb7270975f1f089c4462d5b

libs/WindowManager/Shell/src/com/android/wm/shell/activityembedding/ActivityEmbeddingAnimationRunner.java

@@ -276,7 +276,8 @@ class ActivityEmbeddingAnimationRunner {
             }
 
             final Animation animation;
-            if (!TransitionInfo.isIndependent(change, info)) {
+            if (change.getParent() != null
+                    && handledChanges.contains(info.getChange(change.getParent()))) {
                 // No-op if it will be covered by the changing parent window.
                 animation = ActivityEmbeddingAnimationSpec.createNoopAnimation(change);
             } else if (Transitions.isClosingType(change.getMode())) {