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Signal for treeview column changing size

Hi all. Is there a signal for when a treeview column is resized? I don't see anything on:

https://developer.gnome.org/gtk3/stable/GtkTreeViewColumn.html ( or up the object hierarchy - which gives permissions denied errors, by the way ), or
- https://developer.gnome.org/gtk3/stable/GtkCellRenderer.html 

I'm not 100% on top of which object type I should be looking at in this case.

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