Problem with empty attachment name

[tuptuptup]

There is a problem with attachments, when filename contain diacritic symbols. For example, if original filename is "zażółć gęślą jaźń.pdf", I get an empty attachment filename.

In file IncomingMessageAttachment.php in function getName() after:
if (strtolower($param->attribute) === 'filename') {
$this->name = $param->value;
break;
}
I added:
else{
$this->name = str_replace(array("'"," ","UTF-8"),array("","",""),(urldecode($param->value));
}
Now it's works.