on model-change, ensure QPushButton's state is correct

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@815 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/automatable_button.h

@@ -1,7 +1,7 @@
 /*
  * automatable_button.h - class automatableButton, the base for all buttons
  *
- * Copyright (c) 2006-2007 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ * Copyright (c) 2006-2008 Tobias Doerffel <tobydox/at/users.sourceforge.net>
  * 
  * This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
  *
@@ -47,6 +47,8 @@ public:
 		model()->setJournalling( _on );
 	}
 
+	virtual void modelChanged( void );
+
 
 public slots:
 	virtual void update( void );