iconGrid: Add padWithSpacing property

Add a property to also add the calculated spacing
around the grid.
This will allow FolderView to be aligned with the
main grid without cutting off any of the surrounding
boxPointer decorations or the close button

https://bugzilla.gnome.org/show_bug.cgi?id=706081

js/ui/appDisplay.js

@@ -76,7 +76,8 @@ const BaseAppView = new Lang.Class({
                                                 columnLimit: MAX_COLUMNS,
                                                 minRows: MIN_ROWS,
                                                 minColumns: MIN_COLUMNS,
-                                                fillParent: false });
+                                                fillParent: false,
+                                                padWithSpacing: true });
         params = Params.parse(params, { usePagination: false });
 
         if(params.usePagination)