'fill' justification does nothing

["Fabrizio Lanza" <aquilarubra gmail com>]

 Hello,
I'm developing an application in GTK2::Perl. I noticed a possible bug. Maybe somebody can tell me more.

-If I set the justification on the TextView to 'fill', nothing happens (justification appears 'left').
-If I add a tag in a TextBuffer with the 'fill' justification, nothing happens (justification appears 'left').

Other justifications ('center', 'right', ...) work fine.

Is there some caveat, or is it a bug?

 Thank you, Fabrizio Lanza