make FinishTweening recursive

stepmania/src/ActorFrame.cpp

@@ -88,6 +88,15 @@ void ActorFrame::SetUseZBuffer( bool b )
 		m_SubActors[i]->SetUseZBuffer( b );
 }
 
+void ActorFrame::FinishTweening()
+{
+	Actor::FinishTweening();
+
+	// set all sub-Actors
+	for( unsigned i=0; i<m_SubActors.size(); i++ )
+		m_SubActors[i]->FinishTweening();
+}
+
 float ActorFrame::GetTweenTimeLeft() const
 {
 	float m = Actor::GetTweenTimeLeft();

stepmania/src/ActorFrame.h

@@ -29,6 +29,7 @@ public:
 	virtual void SetDiffuse( RageColor c );
 
 	virtual void SetUseZBuffer( bool b );
+	virtual void FinishTweening();
 	
 	/* Amount of time until all tweens (and all children's tweens) have stopped: */
 	virtual float GetTweenTimeLeft() const;