Changing "move E-Mail to junk folder" in GUI doesnt work

A small update from me:

I tracked it down to

Code:

onclick="return ISPConfig.changeTab('filter_records','mail/mail_user_edit.php');"

in /usr/local/ispconfig/interface/web/mail/templates/mail_user_filter_list.htm
which is referenced by

Code:

{tmpl_var name='filter_records'}

in /usr/local/ispconfig/interface/web/mail/templates/mail_user_mailfilter_edit.htm


After renaming onclick to noclick my problems with the dropdown are gone. But of course, the filter button is no longer working.
I am not that a big pro in HTML/JS, so maybe you can conclude whats wrong there?
When I use the filter (without changing onclick to noclick), it is telling me, that I have unsaved changes, ... Looks like this whole function is buggy. I wonder why I am the only one experiencing this.