I have a gtk3 window with a grid and some widgets for editing data. Some of the data is presented in a treeview.
If the user makes changes to a field in the treeview then clicks on a save button the uncompleted edit is cancelled rather than saved. (If they click on another field the data is saved and I can later write it back to the liststore).
How can I save the data when my save button is clicked?

Do I need to put a gtk.entry into the cellrenderer?
Apply different properties to the cellrenderer (they are pretty much default, except set editable)
Can I do this in a callback attached to the cellrenderer?
or a different callback attached to the save button?

I read somewhere that the data being edited in the cell is held in a buffer, but I can’t remember where I found this.

If there’s an example in Go that would be great, but a solution in any language would point me in the right direction!