'Check if a field with id set to `field_id` is editable.
Arguments:
field_id (str): field id
Returns:
True/False'

def field_is_editable(self, field_id):

    self.wait_for_field(field_id)
    self.make_field_editable(field_id)
    return (self.mode_for_field(field_id) == 'edit')
