If it's only for reordering the elements in the tree view, you can use
the built-in Gtk.TreeView.set_reorderable() method [1], and you're all
set. You get inserted/deleted signals for moved rows so you can know
when and how things changed if needed, and the underlying model is also
changing accordingly.
Of course. Thank you very much, Colomban. It is unbelievable how
complicated I can make simple things.
Cheers,
Reuben
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