Fix old jquery dialog with select2

fix_ui_dialog_select2.js

//Case 1:.
// https://github.com/select2/select2/issues/1246#issuecomment-71710835
// https://stackoverflow.com/questions/19787982/select2-plugin-and-jquery-ui-modal-dialogs/32099212#32099212
// For select2 v4.+

(function ($) {
    if ($.ui && $.ui.dialog && $.ui.dialog.prototype._allowInteraction) {
        var own_allowInteraction = $.ui.dialog.prototype._allowInteraction;
        $.ui.dialog.prototype._allowInteraction = function (e) {
            if ($(e.target).closest('.select2-dropdown').length) return true;
            return own_allowInteraction.apply(this, arguments);
        };
    }
// for version jQuery < 1.10
//    else {
//        $.error("You must upgrade jQuery UI or else.");
//    }
})(jQuery);

//Case 2:.
// https://github.com/select2/select2/issues/1246#issuecomment-71710835
// https://stackoverflow.com/questions/19787982/select2-plugin-and-jquery-ui-modal-dialogs/20031495#20031495
//
//$.ui.dialog.prototype._allowInteraction = function(e) {
//    return !!$(e.target).closest('.ui-dialog, .ui-datepicker, .select2-drop').length;
//};


//Case 3:
// https://github.com/ivaynberg/select2/issues/1246
// https://stackoverflow.com/questions/19787982/select2-plugin-and-jquery-ui-modal-dialogs/19788419#19788419
//.
//$('.dialog').dialog({
//    modal: true,
//    open: function () {
//        if ($.ui && $.ui.dialog && !$.ui.dialog.prototype._allowInteractionRemapped && $(this).closest(".ui-dialog").length)
//            if ($.ui.dialog.prototype._allowInteraction) {
//                $.ui.dialog.prototype._allowInteraction = function (e) {
//                    if ($(e.target).closest('.select2-drop').length) return true;
//                    return ui_dialog_interaction.apply(this, arguments);
//                };
//                $.ui.dialog.prototype._allowInteractionRemapped = true;
//            }
//            else {
//                $.error("You must upgrade jQuery UI or else.");
//            }
//        }
//    },
//    _allowInteraction: function (event) {
//        return !!$(event.target).is(".select2-input") || this._super(event);
//    }
//});