How to resize a message dialog?

[Francesco Montorsi <f18m_cpp217828 yahoo it>]

Hi,

   I need to display a GtkMessageDialog with some long string in it but 
they get all wrapped and so result in being almost unreadable.

How can I disable line wrapping on a GtkMessageDialog?
or alternatively: how can I make a GtkMessageDialog be bigger 
(horizontally)?

I've tried to use

gtk_window_set_resizable(GTK_WINDOW(m_widget), true);

but this result in a user-resizeable window where the label does not 
adapt to the new size (the label widget is private and wrapping is 
disable on it - looking at GTK sources).

gtk_window_set_default_size does not seem to have effect.

I fear that it's impossible to do what I want...

Thanks,
Francesco


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