Setup the model of the returned Gtk::TreeIter

[cedlemo]

Setup the model of the resulting Gtk::TreeIter returned by Gtk::ListStore#prepend

Fix this kind of pb:

model = Gtk::ListStore.new(TrueClass, String)
model.prepend.set_values([true, "item5"])

that returns:

/home/cedlemo/.gem/ruby/2.2.0/gems/gtk3-2.2.6/lib/gtk3/tree-iter.rb:38:in `set_values': undefined method `set_values' for nil:NilClass (NoMethodError)

[cedlemo]

I think that all the methods that return a Gtk::TreePath need to be modified this way. I am okay to add them.Furthermore I think that the test file should be modified/simplified (remove all assert_nothing_raised as you show me in 2e8f549 ). Tell me if you are ok with this and /or if you have any advices.

[kou]

Thanks!

I think that all the methods that return a Gtk::TreePath need to be modified this way.

You're right.

I am okay to add them.

It's very helpful. Please do it!

Furthermore I think that the test file should be modified/simplified (remove all assert_nothing_raised as you show me in 2e8f549 ).

You're right. We should remove them.

Tell me if you are ok with this and /or if you have any advices.

OK! I have no advice. I think that you understand all of them correctly. :-)