_ConvertFromTerminal
BPoint start = _ConvertFromTerminal(fSelection.Start());
BPoint end = _ConvertFromTerminal(fSelection.End());
BPoint startPoint = _ConvertFromTerminal(fCursor);
BPoint loc = _ConvertFromTerminal(fCursor);
BPoint where = _ConvertFromTerminal(fCursor);
inline BPoint _ConvertFromTerminal(const TermPos& pos) const;