Sets the model used by this 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 [[email protected]] yourself if you need to set up different cell renderers for the new model.
| this |
A `GtkComboBox` |
| model |
A `GtkTreeModel` |