Performance and other fixes

include/MainWindow.h

@@ -98,9 +98,9 @@ public:
 	static void restoreWidgetState( QWidget * _w, const QDomElement & _de );
 
 	void collectErrors( const QList<QString>* errors );
-	void collectError( const QString error );
+	void collectError( const QString & error );
 	void clearErrors();
-	void showErrors( const QString reason );
+	void showErrors( const QString & reason );
 
 
 public slots:

include/PlayHandle.h

@@ -55,6 +55,8 @@ public:
 		m_type = p.m_type;
 		m_offset = p.m_offset;
 		m_affinity = p.m_affinity;
+		m_usesBuffer = p.m_usesBuffer;
+		m_audioPort = p.m_audioPort;
 		return *this;
 	}