Bug with filter for attribute with multiple options

I spend couple hourt to make filter with multiple selection. And i found bug.

PRE:
Attrributes:
- checkbox menu (3 options)
- mandatory field - checked
- Multiple selection - checked
Other options without change.

there is no chance to see filter for multiple selection because in template, because in ModuleIsotopeProductFilter.php variable $arrValues has value like this (this is eg for 2 select options):

Code:

---

Array
(
    [0] => a:2:{i:0;s:11:"value 1";i:1;s:13:"value 2";}
)

---

and code:

Code:

---

//ModuleIsotopeProductFilter.php line 280
if (!in_array($option['value'], $arrValues))
                                                {
                                                        unset($arrOptions[$k]);
                                                        continue;
                                                }

---

This is serialized array. So to fix it I wrote:

Code:

---

                    if ( $arrWidget['multiple'] )
                    {
                        $arr = array();
                        for ($i=0, $n=count($arrValues);$i<$n;$i++) {                           
                            $arr = array_merge($arr, unserialize($arrValues[$i]));
                        }
                        $arrValues = $arr;                                               
                    }

---

Now I have in tamplate in $this->filterOptions proper structure to make checkbox filter. I hope it will help for others.

With your changes It gives a proper value in template. Now I have filter with drop down list. But it don't filter at all, does yours?