Signal for treeview column changing size

[Daniel Kasak <d j kasak dk gmail com>]

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.

Dan