Prevent scrolling after the homepage recreating

- Only apply the layout transition when contextual home is enabled
- Do not scroll for highlighting when the homepage is recreated and
  never scrolled

Fix: 222238012
Bug: 222473415
Test: robotest, manual
Change-Id: I490c3f8dbca63a5250bae01555592b7795c90af2

src/com/android/settings/homepage/SettingsHomepageActivity.java

@@ -182,6 +182,8 @@ public class SettingsHomepageActivity extends FragmentActivity implements
             showSuggestionFragment(scrollNeeded);
             if (FeatureFlagUtils.isEnabled(this, FeatureFlags.CONTEXTUAL_HOME)) {
                 showFragment(() -> new ContextualCardsFragment(), R.id.contextual_cards_content);
+                ((FrameLayout) findViewById(R.id.main_content))
+                        .getLayoutTransition().enableTransitionType(LayoutTransition.CHANGING);
             }
         }
         mMainFragment = showFragment(() -> {
@@ -191,9 +193,6 @@ public class SettingsHomepageActivity extends FragmentActivity implements
             return fragment;
         }, R.id.main_content);
 
-        ((FrameLayout) findViewById(R.id.main_content))
-                .getLayoutTransition().enableTransitionType(LayoutTransition.CHANGING);
-
         // Launch the intent from deep link for large screen devices.
         launchDeepLinkIntentToRight();
     }