Settings search - Navigate user to exact page

- remove duplicate index preference
- default set searchable = false when the preference has fragment
- make some fragments indexable

Bug: 143057584
Test: robotest & manual

Change-Id: I4d64f6106d2f92f0a45e8c7e26388677f593f412

src/com/android/settings/deviceinfo/legal/ModuleLicensesDashboard.java

@@ -20,7 +20,13 @@ import android.app.settings.SettingsEnums;
 
 import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settingslib.search.SearchIndexable;
 
+/**
+ * Settings screen for mainline module licenses
+ */
+@SearchIndexable
 public class ModuleLicensesDashboard extends DashboardFragment {
     private static final String TAG = "ModuleLicensesDashboard";
 
@@ -43,4 +49,7 @@ public class ModuleLicensesDashboard extends DashboardFragment {
     public int getHelpResource() {
         return 0;
     }
+
+    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+            new BaseSearchIndexProvider(R.xml.module_licenses);
 }