Focusing on item highlighted coming from search result

There are two cases that require different approach:
1. No scrolling or only a bit of scrolling is required to reach desired
   item - then we can focus the item straight away.
2. We're still scrolling when highlighting is started - after
   DELAY_COLLAPSE_DURATION_MILLIS + DELAY_HIGHLIGHT_DURATION_MILLIS.
   Then we need to wait till we reach the element/stop scrolling and focus
   afterwards.

Test: case 1: search for any setting, press enter and see if keyboard is focused
on search result
Test: case 2: search for setting that requires a lot of scrolling, e.g.
"display cutout" and see if it's get the focus after selecting
Fixes: 307902050

Change-Id: Ifa0738748184e78074099e33e09e5d8df198177e

src/com/android/settings/SettingsPreferenceFragment.java

@@ -479,6 +479,7 @@ public abstract class SettingsPreferenceFragment extends InstrumentedPreferenceF
                 mDialogFragment.dismiss();
                 mDialogFragment = null;
             }
+            getListView().clearOnScrollListeners();
         }
         super.onDetach();
     }