Datepicker: Fixed #4804 onChangeMonthYear fires at first run

Author: kbwood

ui/jquery.ui.datepicker.js

@@ -259,7 +259,7 @@ $.extend(Datepicker.prototype, {
 				return this._get(inst, key);
 			});
 		$.data(target, PROP_NAME, inst);
-		this._setDate(inst, this._getDefaultDate(inst));
+		this._setDate(inst, this._getDefaultDate(inst), true);
 		this._updateDatepicker(inst);
 		this._updateAlternate(inst);
 	},
@@ -1302,15 +1302,15 @@ $.extend(Datepicker.prototype, {
 	},
 
 	/* Set the date(s) directly. */
-	_setDate: function(inst, date) {
+	_setDate: function(inst, date, noChange) {
 		var clear = !(date);
 		var origMonth = inst.selectedMonth;
 		var origYear = inst.selectedYear;
 		date = this._restrictMinMax(inst, this._determineDate(inst, date, new Date()));
 		inst.selectedDay = inst.currentDay = date.getDate();
 		inst.drawMonth = inst.selectedMonth = inst.currentMonth = date.getMonth();
 		inst.drawYear = inst.selectedYear = inst.currentYear = date.getFullYear();
-		if (origMonth != inst.selectedMonth || origYear != inst.selectedYear)
+		if ((origMonth != inst.selectedMonth || origYear != inst.selectedYear) && !noChange)
 			this._notifyChange(inst);
 		this._adjustInstDate(inst);
 		if (inst.input) {