doesn't work for ls --group-directories-first

[rr0gi]

$ alias zz='ls --group-directories-first'
$ complete -F _complete_alias zz
$ zz path_to_file<tab>

[rr0gi]

more precisely - it doesn't work if it is the last option in the aliased command, witness:

$ alias short='ls --group-directories-first -hlA'
$ alias long='ls -hlA --group-directories-first'
$ complete -F _complete_alias short
$ complete -F _complete_alias long

short ~/.bashr<Tab> completes, while long ~/.bashr<Tab> doesn't