Datepicker: day with same day number as today is active in past and future months

[rdworth]

This bug was introduced by #5676

See ​http://forum.jquery.com/topic/removing-highlighting-from-datepicker

Here's a workaround:

$("#datepicker").datepicker({
  onChangeMonthYear: function() {
    setTimeout(function() {
      $(".ui-datepicker .ui-state-active").removeClass("ui-state-active");
    }, 0);
  }
});

1.8.5 workaround demo: ​http://jsbin.com/owape4

As for the bug, here are minimal test cases:

1.8.2 (before) ​http://jsbin.com/owoxa4

1.8.4 (after) ​http://jsbin.com/eyedu3

Steps to reproduce

1. Click in the text box to open the datepicker
2. Click forward a month or back a month

• Expected behavior: no dates are active
• Actual behavior: the day with the same day num as today's date is active

[Scott González]

Duplicate of #5984.