Datepicker: only set the focus explicitly if it is not already on the…

… target field. Fixed #6694 – datepicker does not fire change event in IE8

jQuery stores the current content of a field whenever it gets the focus. Since the fixed function is also called for KeyUp events the change event is not triggered anymore when the input looses focus.

ui/jquery.ui.datepicker.js

@@ -700,7 +700,9 @@ $.extend(Datepicker.prototype, {
 		inst.dpDiv[(this._get(inst, 'isRTL') ? 'add' : 'remove') +
 			'Class']('ui-datepicker-rtl');
 		if (inst == $.datepicker._curInst && $.datepicker._datepickerShowing && inst.input &&
-				inst.input.is(':visible') && !inst.input.is(':disabled'))
+				// #6694 - don't focus the input if it's already focused
+				// this breaks the change event in IE
+				inst.input.is(':visible') && !inst.input.is(':disabled') && inst.input[0] != document.activeElement)
 			inst.input.focus();
 		// deffered render of the years select (to avoid flashes on Firefox) 
 		if( inst.yearshtml ){