Cell size

[Glus Xof <gtglus gmail com>]

In my app, a Gtk::TreeView is included in a Gtk::ScrolledWindow...

In a precedent message, I asked for the cell wrapping method... but
right now, I cannot see the method to set the "property_wrap_width()"
according the Gtk::ScrolledWindow width.

(The concerned cells are the last column ones... so, resize when the
app main window resize too).

Glus.