iter is within an editable region
of text. Non-editable text is "locked" and can't be changed by the
user via GtkTextView. This function is simply a convenience
wrapper around gtkTextIterGetAttributes. If no tags applied
to this text affect editability, default.setting will be returned.gtkTextIterEditable(object, default.setting)objectdefault.settingTRUE if text is editable by defaultiter is inside an editable rangeiter, 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 gtkTextIterCanInsert to handle this
case.