[gtkada] showing and editing different types in same treeview column

[Rob Groen]

Hello, 

In a GtkTreeView I want to show and edit in the same column different
types of entities, e.g. integers, strings, enums. I would like to edit
these entities using spinbutton, entry and combobox respectively. Also,
some of the entities are editable, and some aren't. 

What I can do is pack 3 different renderers in the treeview column, but
that implies for each renderer a different column in the underlying
tree/list-store to set the value and the editability of the renderer. 

Is there a better / more convenient way to do this? 

Regards, 

Rob Groen
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