Returns whether the character at @iter is within an editable region of text. Non-editable text is "locked" and can't be changed by the user via. This function is simply a convenience wrapper around gtk_text_iter_get_attributes (). If no tags applied to this text affect editability, @default_setting will be returned. You don't want to use this function to decide whether text can be inserted at @iter, because for insertion you don't want to know whether the char at @iter is inside an editable range, you want to know whether a new character inserted at @iter would be inside an editable range. Use gtk_text_iter_can_insert() to handle this case.