timeline hierarchical length signalling

app/widget/timelineview/timelineviewrect.cpp

@@ -22,7 +22,6 @@
 
 TimelineViewRect::TimelineViewRect(QGraphicsItem* parent) :
   QGraphicsRectItem(parent),
-  scale_(1.0),
   y_(0),
   height_(0)
 {
@@ -69,8 +68,3 @@ void TimelineViewRect::SetScale(const double &scale)
 
   UpdateRect();
 }
-
-double TimelineViewRect::TimeToScreenCoord(const rational &time)
-{
-  return time.toDouble() * scale_;
-}