Always show CHANGE containers in transition setup

This shouldn't be necessary, but it acts as a failsafe in case
a previous transition messes-up visibility in its finishTransaction.

Bug: 280737703
Test: launch app, swipe-to-home, relaunch the app before home animation
      finishes.
Change-Id: Ic7a81e313b35310061c9278ea72c98cc0bf20ef7

core/java/android/window/TransitionInfo.java

@@ -493,6 +493,9 @@ public final class TransitionInfo implements Parcelable {
         if ((flags & FLAG_FIRST_CUSTOM) != 0) {
             sb.append(sb.length() == 0 ? "" : "|").append("FIRST_CUSTOM");
         }
+        if ((flags & FLAG_MOVED_TO_TOP) != 0) {
+            sb.append(sb.length() == 0 ? "" : "|").append("MOVE_TO_TOP");
+        }
         return sb.toString();
     }
 

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

@@ -492,6 +492,10 @@ public class Transitions implements RemoteCallable<Transitions>,
                 finishT.show(leash);
             } else if (mode == TRANSIT_CLOSE || mode == TRANSIT_TO_BACK) {
                 finishT.hide(leash);
+            } else if (isOpening && mode == TRANSIT_CHANGE) {
+                // Just in case there is a race with another animation (eg. recents finish()).
+                // Changes are visible->visible so it's a problem if it isn't visible.
+                t.show(leash);
             }
         }
     }