Datepicker: Allow descendant elements in triggers. Fixes #8107 - Clos…

…ing the datepicker via the provided button does not work in Chrome when the button contains other non-text elements.

(cherry picked from commit c964894)

ui/jquery.ui.datepicker.js

@@ -845,7 +845,7 @@ $.extend(Datepicker.prototype, {
 		if ( ( ( $target[0].id != $.datepicker._mainDivId &&
 				$target.parents('#' + $.datepicker._mainDivId).length == 0 &&
 				!$target.hasClass($.datepicker.markerClassName) &&
-				!$target.hasClass($.datepicker._triggerClass) &&
+				!$target.closest("." + $.datepicker._triggerClass).length &&
 				$.datepicker._datepickerShowing && !($.datepicker._inDialog && $.blockUI) ) ) ||
 			( $target.hasClass($.datepicker.markerClassName) && $.datepicker._curInst != inst ) )
 			$.datepicker._hideDatepicker();