Show AutoCompleteTextView dropdown in Search dialog when cursor updates. Fixes b/2426929

Calls onFilterComplete when the data set changes, so that it can recompute whether
the dropdown should be shown or not.

core/java/android/app/SearchDialog.java

@@ -576,7 +576,14 @@ public class SearchDialog extends Dialog implements OnItemClickListener, OnItemS
         }
         mVoiceButton.setVisibility(visibility);
     }
-    
+
+    /** Called by SuggestionsAdapter when the cursor contents changed. */
+    void onDataSetChanged() {
+        if (mSearchAutoComplete != null && mSuggestionsAdapter != null) {
+            mSearchAutoComplete.onFilterComplete(mSuggestionsAdapter.getCount());
+        }
+    }
+
     /**
      * Hack to determine whether this is the browser, so we can adjust the UI.
      */

core/java/android/app/SuggestionsAdapter.java

@@ -189,6 +189,8 @@ class SuggestionsAdapter extends ResourceCursorAdapter {
         if (DBG) Log.d(LOG_TAG, "notifyDataSetChanged");
         super.notifyDataSetChanged();
 
+        mSearchDialog.onDataSetChanged();
+
         updateSpinnerState(getCursor());
     }