Datepicker: use a setTimeout 0 so the same code can run in IE (as oth…

…er browsers) to set focus back to the datepicker text input if a month or year drop-down is clicked closed. Fixes #5897 - Datepicker: inconsistent behavior in IE when click to close month and year drop-downs

ui/jquery.ui.datepicker.js

@@ -846,8 +846,11 @@ $.extend(Datepicker.prototype, {
 	_clickMonthYear: function(id) {
 		var target = $(id);
 		var inst = this._getInst(target[0]);
-		if (inst.input && inst._selectingMonthYear && !$.browser.msie)
-			inst.input.focus();
+		if (inst.input && inst._selectingMonthYear) {
+			setTimeout(function() {
+				inst.input.focus();
+			}, 0);
+		}
 		inst._selectingMonthYear = !inst._selectingMonthYear;
 	},