Put change type below closing type for a close transition

Assume a translucent task is closing, the next visible task
may be added to transition participant by collectOrderChanges
as the task is moving to the foreground. Then the transition
info will be {CLOSE, top:CHANGE, bottom:CLOSE}.
So the z-order will be:
 numChanges=2
 zSplitLine=3
 CLOSE=3+2-1=4
 CHANGE=3+2-0=5

Then the CLOSE is occluded by the CHANGE incorrectly.

Bug: 281010752
Test: Launch a translucent activity from launcher and it calls
      Activity#finishAndRemoveTask(). The activity should not
      be covered by the icon on launcher during animation.
Change-Id: I1236946c867abf1b93fca39c4dd9ed114118c051

libs/WindowManager/Shell/src/com/android/wm/shell/transition/Transitions.java

@@ -503,7 +503,9 @@ public class Transitions implements RemoteCallable<Transitions>,
      */
     private static void setupAnimHierarchy(@NonNull TransitionInfo info,
             @NonNull SurfaceControl.Transaction t, @NonNull SurfaceControl.Transaction finishT) {
-        boolean isOpening = isOpeningType(info.getType());
+        final int type = info.getType();
+        final boolean isOpening = isOpeningType(type);
+        final boolean isClosing = isClosingType(type);
         for (int i = 0; i < info.getRootCount(); ++i) {
             t.show(info.getRoot(i).getLeash());
         }
@@ -556,7 +558,13 @@ public class Transitions implements RemoteCallable<Transitions>,
                     layer = zSplitLine + numChanges - i;
                 }
             } else { // CHANGE or other
-                layer = zSplitLine + numChanges - i;
+                if (isClosing) {
+                    // Put below CLOSE mode.
+                    layer = zSplitLine - i;
+                } else {
+                    // Put above CLOSE mode.
+                    layer = zSplitLine + numChanges - i;
+                }
             }
             t.setLayer(leash, layer);
         }