Read from dconf the value of compat_{backspace,delete} vars
        and select the right option in combos.

def reload_erase_combos(self, btn=None):
        """Read from dconf the value of compat_{backspace,delete} vars
        and select the right option in combos.
        """
        # backspace erase binding
        combo = self.get_widget('backspace-binding-combobox')
        binding = self.settings.general.get_string('compat-backspace')
        for i in combo.get_model():
            if ERASE_BINDINGS.get(i[0]) == binding:
                combo.set_active_iter(i.iter)
                break

        # delete erase binding
        combo = self.get_widget('delete-binding-combobox')
        binding = self.settings.general.get_string('compat-delete')
        for i in combo.get_model():
            if ERASE_BINDINGS.get(i[0]) == binding:
                combo.set_active_iter(i.iter)
                break