Center the search results as well

Use overlay_scrollbars and the same padding.

https://bugzilla.gnome.org/show_bug.cgi?id=694701

data/theme/gnome-shell.css

@@ -860,6 +860,7 @@ StScrollBar StButton#vhandle:active {
     padding: 4px 16px;
 }
 
+.search-display > StBoxLayout,
 .all-apps > StBoxLayout,
 .frequent-apps > StBoxLayout {
     /* horizontal padding to make sure the scrollbar doesn't overlap content */

js/ui/searchDisplay.js

@@ -331,7 +331,8 @@ const SearchResults = new Lang.Class({
 
         this._scrollView = new St.ScrollView({ x_fill: true,
                                                y_fill: false,
-                                               style_class: 'vfade' });
+                                               overlay_scrollbars: true,
+                                               style_class: 'search-display vfade' });
         this._scrollView.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC);
         this._scrollView.add_actor(scrollChild);
         let action = new Clutter.PanAction({ interpolate: true });