There are much more to explore. The most effective way I found to
approach this kind of issues is grepping inside the source tree:
$ grep -rl gtk_tree_view *.c
gtkappchooserwidget.c
...
Thanks for the suggestion, Nicola.
After looking at gtkfilechooserdefault.c a bit, I guess I would interpret
that code as showing that while a file chooser dialog is not a
descendant of a GtkTreeView, it uses some private internal data strutures
which are in fact GtkTreeView (or related) objects. I guess the same would
apply to other object types which make some private use of a hidden
GtkTreeView object while not being directly related themselves to
GtkTreeView.
Thanks!
Roger
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