Fix unwanted animation when opening Modes list

Fixes: 356151158
Test: manual
Flag: android.app.modes_ui
Change-Id: Ibbc54c68c4bcbf75e908d4a36ef2d8f609b5b797

src/com/android/settings/notification/modes/ZenModesListPreferenceController.java

@@ -38,7 +38,8 @@ import java.util.Map;
  * containing links to each individual mode. This is a central controller that populates and updates
  * all the preferences that then lead to a mode configuration page.
  */
-class ZenModesListPreferenceController extends BasePreferenceController {
+class ZenModesListPreferenceController extends BasePreferenceController
+        implements BasePreferenceController.UiBlocker {
     protected static final String KEY = "zen_modes_list";
 
     protected ZenModesBackend mBackend;
@@ -48,11 +49,6 @@ class ZenModesListPreferenceController extends BasePreferenceController {
         mBackend = backend;
     }
 
-    @Override
-    public String getPreferenceKey() {
-        return KEY;
-    }
-
     @Override
     @AvailabilityStatus
     public int getAvailabilityStatus() {
@@ -97,6 +93,8 @@ class ZenModesListPreferenceController extends BasePreferenceController {
         for (String key : originalPreferences.keySet()) {
             category.removePreferenceRecursively(key);
         }
+
+        setUiBlockerFinished(true);
     }
 
     // Provide search data for the modes, which will allow users to reach the modes page if they