Datepicker: added check to account for multiple pickers on one page. …

…Fixed #5818 – multiple DatePickers won't trigger close event(cherry picked from commit 82cf9e2)

ui/jquery.ui.datepicker.js

@@ -233,7 +233,10 @@ $.extend(Datepicker.prototype, {
 			inst.trigger.click(function() {
 				if ($.datepicker._datepickerShowing && $.datepicker._lastInput == input[0])
 					$.datepicker._hideDatepicker();
-				else
+				else if ($.datepicker._datepickerShowing && $.datepicker._lastInput != input[0]) {
+					$.datepicker._hideDatepicker(); 
+					$.datepicker._showDatepicker(input[0]);
+				} else
 					$.datepicker._showDatepicker(input[0]);
 				return false;
 			});