appDisplay: Show newly created folder when creating

The icon grid currently sorts icons by their names. When creating new
folders, the folder may end up being in a different page, and that's
confusing since we don't actually move to where the new folder is.

Move the icon grid to the newly created folder.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/883

js/ui/appDisplay.js

@@ -923,6 +923,8 @@ var AllView = GObject.registerClass({
         newFolderSettings.set_strv('apps', apps);
         newFolderSettings.apply();
 
+        this.selectApp(newFolderId);
+
         return true;
     }
 });