Slider positioning does not take handle with into account

This is a regression from rc2 to rc4.

When positioning the handle their width is not taken into account, and the result is that they are positioned too far to the right.

I will attach a screenshot of the slider to this ticket.

For reference our markup looks like this:

<fieldset id="price">
  <label style="left:0">Min <abbr>€</abbr> <input value="0" id="minimumPrice" name="price_min" type="text" /></label>
  <label style="left:180px">Max <abbr>€</abbr> <input value="4300" id="maximumPrice" name="price_max" type="text" /></label>
</fieldset>

and it is initialized like this:

var max_price = 4300;

$("#price")
    .find("label").addClass("ui-slider-handle").end()
    .slider({
        range    : true,
        min      : 0,
        max      : max_price,
        values   : [ $("#minimumPrice").attr("value"),
                     $("#maximumPrice").attr("value") ],
                  });