Send empty inline response to IME if augmented autofill returns no suggestion

* The augmented autofill may dynamically request an autofill request
  which will "invalidate" the old suggestions. In case the new request
  doesn't return any suggestions, we need to make sure the old
  suggestions are removed from the IME.
* See the scenario in https://b.corp.google.com/issues/158038231#comment14

Test: manual
Test: atest android.autofillservice.cts.inline
Bug: 157515522
Bug: 158038231

Change-Id: If85592395ad918197566a5ca556fba8ccc971071

2 files changed, 7 insertions, 2 deletions

diff --git a/services/autofill/java/com/android/server/autofill/AutofillInlineSuggestionsRequestSession.java b/services/autofill/java/com/android/server/autofill/AutofillInlineSuggestionsRequestSession.java
index e7a43b75f9d5..48895ad42e99 100644
--- a/services/autofill/java/com/android/server/autofill/AutofillInlineSuggestionsRequestSession.java
+++ b/services/autofill/java/com/android/server/autofill/AutofillInlineSuggestionsRequestSession.java
@@ -93,7 +93,7 @@ final class AutofillInlineSuggestionsRequestSession {
     @Nullable
     private InlineFillUi mInlineFillUi;
     @GuardedBy("mLock")
-    private boolean mPreviousResponseIsNotEmpty;
+    private Boolean mPreviousResponseIsNotEmpty = null;
 
     @GuardedBy("mLock")
     private boolean mDestroyed = false;
@@ -213,7 +213,7 @@ final class AutofillInlineSuggestionsRequestSession {
             // if IME is visible, and response is not null, send the response
             InlineSuggestionsResponse response = mInlineFillUi.getInlineSuggestionsResponse();
             boolean isEmptyResponse = response.getInlineSuggestions().isEmpty();
-            if (isEmptyResponse && !mPreviousResponseIsNotEmpty) {
+            if (isEmptyResponse && Boolean.FALSE.equals(mPreviousResponseIsNotEmpty)) {
                 // No-op if both the previous response and current response are empty.
                 return;
             }
diff --git a/services/autofill/java/com/android/server/autofill/RemoteAugmentedAutofillService.java b/services/autofill/java/com/android/server/autofill/RemoteAugmentedAutofillService.java
index 851e4cc0bfd1..a7d0061cc043 100644
--- a/services/autofill/java/com/android/server/autofill/RemoteAugmentedAutofillService.java
+++ b/services/autofill/java/com/android/server/autofill/RemoteAugmentedAutofillService.java
@@ -245,6 +245,11 @@ final class RemoteAugmentedAutofillService
         if (inlineSuggestionsData == null || inlineSuggestionsData.isEmpty()
                 || inlineSuggestionsCallback == null || request == null
                 || remoteRenderService == null) {
+            // If it was an inline request and the response doesn't have any inline suggestions,
+            // we will send an empty response to IME.
+            if (inlineSuggestionsCallback != null && request != null) {
+                inlineSuggestionsCallback.apply(InlineFillUi.emptyUi(focusedId));
+            }
             return;
         }
         mCallbacks.setLastResponse(sessionId);