Changing a GtkCellRendererCombo based on another column

[Murray Cumming <murrayc murrayc com>]

Let's say I have two columns in my treeview: country and town.

When the user selects something from the combobox in the country column,
I want the contents of the combobox to change in the town column, so
that the user only sees towns in that country.

I could just change the town combobox model in response to the country's
"edited" signal, but when you click on a GtkCellRendererCombo, it shows
its menu before the previous cell has emitted that signal.

-- 
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