[RESTRICT AUTOMERGE] Attempt to fix exception in IMS

IMS might throw IllegalStateException in
WindowContextController#attachToWindowToken when #initializeInternal
is called. A possible root cause may be #initializeInternal is called
after onDestroy, which detach IMS from ImeContainer.

This CL add a flag in #onDestroy to prevent #initializeInternal from
being called after #onDestroy.

Bug: 211062619
Test: presubmit

Change-Id: Ie7814da801878a3487123fefdc9e71d0e1ed28d7

core/java/android/inputmethodservice/InputMethodService.java

@@ -524,6 +524,7 @@ public class InputMethodService extends AbstractInputMethodService {
     private Handler mHandler;
     private boolean mImeSurfaceScheduledForRemoval;
     private ImsConfigurationTracker mConfigTracker = new ImsConfigurationTracker();
+    private boolean mDestroyed;
 
     /**
      * An opaque {@link Binder} token of window requesting {@link InputMethodImpl#showSoftInput}
@@ -604,6 +605,11 @@ public class InputMethodService extends AbstractInputMethodService {
                 Log.w(TAG, "The token has already registered, ignore this initialization.");
                 return;
             }
+            if (mDestroyed) {
+                Log.i(TAG, "The InputMethodService has already onDestroyed()."
+                    + "Ignore the initialization.");
+                return;
+            }
             Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "IMS.initializeInternal");
             mConfigTracker.onInitialize(configChanges);
             mPrivOps.set(privilegedOperations);
@@ -1403,6 +1409,7 @@ public class InputMethodService extends AbstractInputMethodService {
     }
 
     @Override public void onDestroy() {
+        mDestroyed = true;
         super.onDestroy();
         mRootView.getViewTreeObserver().removeOnComputeInternalInsetsListener(
                 mInsetsComputer);