MDL-35675 forms: Popup calendar is not constrained any more

lib/form/yui/dateselector/dateselector.js

@@ -115,7 +115,6 @@ YUI.add('moodle-form-dateselector', function(Y) {
             M.form.dateselector.currentowner = this;
             M.form.dateselector.calendar.cfg.setProperty('mindate', new Date(this.yearselect.firstOptionValue(), 0, 1));
             M.form.dateselector.calendar.cfg.setProperty('maxdate', new Date(this.yearselect.lastOptionValue(), 11, 31));
-            M.form.dateselector.panel.set('constrain', this.get('node').ancestor('form'));
             M.form.dateselector.panel.show();
             M.form.dateselector.fix_position();
             setTimeout(function(){M.form.dateselector.cancel_any_timeout()}, 100);
@@ -245,7 +244,6 @@ YUI.add('moodle-form-dateselector', function(Y) {
         },
         fix_position : function() {
             if (this.currentowner) {
-                this.panel.set('constrain', Y.one(document.body));
                 this.panel.set('align', {
                     node:this.currentowner.get('node').one('select'),
                     points:[Y.WidgetPositionAlign.BL, Y.WidgetPositionAlign.TL]