Datepicker: Escape single quotes in tooltips. Fixes #9049 - Datepicke…

…r beforeShowDay tooltip not displayed properly if single quote is used.

tests/unit/datepicker/datepicker_options.js

@@ -782,6 +782,21 @@ test("callbacks", function() {
 	inp.datepicker("hide").datepicker("destroy");
 });
 
+test("beforeShowDay - tooltips with quotes", function() {
+	expect( 1 );
+	var inp, dp;
+	inp = TestHelpers.datepicker.init("#inp", {
+		beforeShowDay: function() {
+			return [ true, "", "'" ];
+		}
+	});
+	dp = $("#ui-datepicker-div");
+
+	inp.datepicker("show");
+	equal( dp.find( ".ui-datepicker-calendar td:contains('9')").attr( "title" ), "'" );
+	inp.datepicker("hide").datepicker("destroy");
+});
+
 test("localisation", function() {
 	expect( 24 );
 	var dp, month, day, date,

ui/jquery.ui.datepicker.js

@@ -1741,7 +1741,7 @@ $.extend(Datepicker.prototype, {
 							(otherMonth && !showOtherMonths ? "" : " " + daySettings[1] + // highlight custom dates
 							(printDate.getTime() === currentDate.getTime() ? " " + this._currentClass : "") + // highlight selected day
 							(printDate.getTime() === today.getTime() ? " ui-datepicker-today" : "")) + "'" + // highlight today (if different)
-							((!otherMonth || showOtherMonths) && daySettings[2] ? " title='" + daySettings[2] + "'" : "") + // cell title
+							((!otherMonth || showOtherMonths) && daySettings[2] ? " title='" + daySettings[2].replace(/'/g, "'") + "'" : "") + // cell title
 							(unselectable ? "" : " data-handler='selectDay' data-event='click' data-month='" + printDate.getMonth() + "' data-year='" + printDate.getFullYear() + "'") + ">" + // actions
 							(otherMonth && !showOtherMonths ? " " : // display for other months
 							(unselectable ? "<span class='ui-state-default'>" + printDate.getDate() + "</span>" : "<a class='ui-state-default" +