setting a right margin

[Ultrakorne <ultrakorne paranoici org>]

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Hi everyone
i am developing with gtkmm2.4 and i have the following problem:
i need to set a maximum right margin in a textview (into a scrolled
window, with horizontal scroll set NEVER) so when the text reaches that
margin it goes into a new line. (something like xchat do)
i tryed to set it with set_right_margin but it didnt work, and
set_justification( Gtk::JUSTIFY_FILL) is not yet implemented
(gtk::warning tell me). i also tryed to set the right margin using the
text tag, but also that didnt work

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