Will unset a previously set model (if applicable). If model is %NULL,
then it will unset the model.
Note that this function does not clear the cell renderers, you have to
call [method@Gtk.CellLayout.clear] yourself if you need to set up different
cell renderers for the new model.
Sets the model used by @combo_box to be @model.
Will unset a previously set model (if applicable). If model is %NULL, then it will unset the model.
Note that this function does not clear the cell renderers, you have to call [method@Gtk.CellLayout.clear] yourself if you need to set up different cell renderers for the new model.