fix sync overlay help sticks around between stages

stepmania/src/ScreenSyncOverlay.cpp

@@ -67,8 +67,7 @@ void ScreenSyncOverlay::Update( float fDeltaTime )
 	this->SetVisible( IsGameplay() );
 	if( !IsGameplay() )
 	{
-		m_quad.SetDiffuseAlpha( 0 );
+		HideHelp();
-		m_textHelp.SetDiffuseAlpha( 0 );
 		return;
 	}
 
@@ -240,6 +239,13 @@ void ScreenSyncOverlay::ShowHelp()
 	m_textHelp.SetDiffuseAlpha( 0 );
 }
 
+void ScreenSyncOverlay::HideHelp()
+{
+	m_quad.FinishTweening();
+	m_textHelp.FinishTweening();
+}
+
+
 /*
  * (c) 2001-2005 Chris Danford
  * All rights reserved.

stepmania/src/ScreenSyncOverlay.h

@@ -19,6 +19,7 @@ public:
 private:
 	void UpdateText();
 	void ShowHelp();
+	void HideHelp();
 
 	Quad		m_quad;
 	BitmapText	m_textHelp;