Ignore apply input transaction for removed activity.

Ignore to apply input trasaction for the activity which is removed
from window hierarchy, which might happen after a transition finished.

Bug: 236931014
Test: enable shell transition, launch an activity which will crash at
onCreate, and verify no system server crash after transition finish.

Change-Id: Icde817ab598ec08c1b9c42afd1394b8b1aba0327

services/core/java/com/android/server/wm/Transition.java

@@ -672,7 +672,7 @@ class Transition extends Binder implements BLASTSyncEngine.TransactionReadyListe
         SurfaceControl.Transaction inputSinkTransaction = null;
         for (int i = 0; i < mParticipants.size(); ++i) {
             final ActivityRecord ar = mParticipants.valueAt(i).asActivityRecord();
-            if (ar == null || !ar.isVisible()) continue;
+            if (ar == null || !ar.isVisible() || ar.getParent() == null) continue;
             if (inputSinkTransaction == null) {
                 inputSinkTransaction = new SurfaceControl.Transaction();
             }