1.5 Textinput: Enhanced doesn't work as expected

[jaspermdegroot]

The widget treats the form element as wrapper and adds classes to it, while there is already a div that serves as wrapper present in the markup.
See http://view.jquerymobile.com/1.5-css-and-demos/demos/textinput/#Enhanced

[apsdehal]

This happens because textinput on the demo page doesn't have any div wrapper among it. See https://github.com/jquery/jquery-mobile/blob/1.5-dev/demos/textinput/index.php#L342 . In these cases when the parent has more than one child, I think we should create a wrapper around the element.