AutomatableModel: do not return an out of range value in fittedValue()

If a certain step was set for a model, the fitted value (i.e. value
divided by step, rounded and multiplied with step again) could become
smaller than minValue or greater than maxValue. Therefore explicitely
check those cases after performing the described calculation.

Closes #2840202.

src/core/automatable_model.cpp

@@ -1,8 +1,8 @@
 /*
  * automatable_model.cpp - some implementations of automatableModel-class
  *
- * Copyright (c) 2008 Tobias Doerffel <tobydox/at/users.sourceforge.net>
- * 
+ * Copyright (c) 2008-2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ *
  * This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
  *
  * This program is free software; you can redistribute it and/or
@@ -311,6 +311,15 @@ float automatableModel::fittedValue( float _value ) const
 		_value = 0;
 	}
 
+	if( _value < m_minValue )
+	{
+		return m_minValue;
+	}
+	else if( _value > m_maxValue )
+	{
+		return m_maxValue;
+	}
+
 	return _value;
 }