Cancel merges in RecentsTransitionHandler if it's always on top

Merging the bubble open animation with the recents animation results
in a bad and unrecoverable state for bubbles so skip the merge.

Test: manual - 1) have a bubble and a normal activity open
               2) swipe up to go home and tap on the bubble quickly
               => observe the bubble opens normally
Bug: 273966970
Change-Id: I577663869897b8781b0d5e670097afdb5b8b8524

libs/WindowManager/Shell/src/com/android/wm/shell/recents/RecentsTransitionHandler.java

@@ -418,6 +418,13 @@ public class RecentsTransitionHandler implements Transitions.TransitionHandler {
             for (int i = 0; i < info.getChanges().size(); ++i) {
                 final TransitionInfo.Change change = info.getChanges().get(i);
                 final ActivityManager.RunningTaskInfo taskInfo = change.getTaskInfo();
+                if (taskInfo != null
+                        && taskInfo.configuration.windowConfiguration.isAlwaysOnTop()) {
+                    // Tasks that are always on top (e.g. bubbles), will handle their own transition
+                    // as they are on top of everything else. So cancel the merge here.
+                    cancel();
+                    return;
+                }
                 hasTaskChange = hasTaskChange || taskInfo != null;
                 final boolean isLeafTask = leafTaskFilter.test(change);
                 if (TransitionUtil.isOpeningType(change.getMode())) {