add HideSystemMessage

stepmania/src/ScreenManager.cpp

@@ -577,6 +577,11 @@ void ScreenManager::SystemMessageNoAnimate( const CString &sMessage )
 	MESSAGEMAN->Broadcast( "SystemMessageNoAnimate" );
 }
 
+void ScreenManager::HideSystemMessage()
+{
+	MESSAGEMAN->Broadcast( "HideSystemMessage" );
+}
+
 
 void ScreenManager::RefreshCreditsMessages()
 {

stepmania/src/ScreenManager.h

@@ -75,6 +75,7 @@ public:
 	void PopTopScreen( ScreenMessage SM );
 	void SystemMessage( const CString &sMessage );
 	void SystemMessageNoAnimate( const CString &sMessage );
+	void HideSystemMessage();
 
 	void PostMessageToTopScreen( ScreenMessage SM, float fDelay );
 	void SendMessageToTopScreen( ScreenMessage SM );

stepmania/src/ScreenSystemLayer.cpp

@@ -251,6 +251,12 @@ void ScreenSystemLayer::HandleMessage( const CString &sMessage )
 		m_textMessage.FinishTweening();
 		m_textMessage.PlayCommand( "Off" );
 	}
+	else if( sMessage == "HideSystemMessage" )
+	{
+		m_sprMessageFrame->SetHidden( true );
+
+		m_textMessage.SetHidden( true );
+	}
 	Screen::HandleMessage( sMessage );
 }