Patch proposed for #3861 - Manually entered date do not update altField

Patch proposed for #3861 - Manually entered date do not update altField

Hi all,
I am a web developer out of New York city. I have just submitted a patch for the defect #3861 for the datepicker altField which is not updated when the main field is directly modified by the user.
The proposed patch update the altField on the keyUp event but only if the date typed is valid.
In the patch I am also suggesting to update the datepicker, when that happens, since it seems to make sense from a user perspective. Although this is not part of the original defect.
It's my first patch for jquery UI so please don't hesitate to give me some feedbacks if you get a chance to review it.
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Christophe