fix tween overflow in Actor commands that call themself

stepmania/src/Actor.cpp

@@ -387,6 +387,9 @@ void Actor::BeginTweening( float time, TweenType tt )
 	{
 		// initialize the new TS from the last TS in the list
 		TS = m_TweenStates[m_TweenStates.size()-2];
+
+		// don't inherit the queued state's command
+		TS.command.Clear();
 	}
 	else
 	{
@@ -908,7 +911,7 @@ void Actor::Sleep( float time )
 	BeginTweening( 0, TWEEN_LINEAR ); 
 }
 
-void Actor::QueueCommand( Command command )
+void Actor::QueueCommand( const Command& command )
 {
 	BeginTweening( 0, TWEEN_LINEAR ); 
 	DestTweenState().command = command;

stepmania/src/Actor.h

@@ -182,7 +182,7 @@ public:
 	void BeginTweening( float time, TweenType tt = TWEEN_LINEAR );
 	void StopTweening();
 	void Sleep( float time );
-	void QueueCommand( Command command );
+	void QueueCommand( const Command& command );
 	virtual void FinishTweening();
 	virtual void HurryTweening( float factor );
 	// Let ActorFrame and BGAnimation override

stepmania/src/Command.h

@@ -14,6 +14,8 @@ public:
 
 	CString		GetName() const;	// the command name is the first argument in all-lowercase 
 
+	void Clear() { m_vsArgs.clear(); }
+
 	struct Arg
 	{
 		CString s;