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I get a crash when I call the CellRenderers property in a TreeViewColumn.
In TreeViewColumn.cs , you call gtk_tree_view_column_get_cell_renderers, which no longer exists in Gtk3.
The right function call is gtk_cell_layout_get_cells . Indeed, now Gtk# creates a Cells property in Gtk.TreeViewColumn which has the same signature and works just fine.
It is not clear to me whether or not the code you use to wrap gtk_tree_view_column_get_cell_renderers is still needed or not: it was added in a commit in 2004  "manually wrap GList api using typed arrays"
Thank you for your bug report.
The code was added at the time when the generator didn't do the right thing for functions returning a GList. So it's been obsolete for some time now, and is now wrong because the native function is gone.
I've removed the TreeViewColumn.CellRenderers property in git master :
So this is fixed, but I can't close the bug myself, so feel free to mark it a RESOLVED / FIXED