fix OptionRow doesn't unsubscribe to Messages

stepmania/src/OptionRow.cpp

@@ -57,15 +57,19 @@ void OptionRow::Clear()
 		m_Underline[p].clear();
 	}
 
+	ASSERT( m_pHand == NULL );
+
+	m_bFirstItemGoesDown = false;
+}
+
+void OptionRow::DetachHandler()
+{
 	if( m_pHand )
 	{
 		FOREACH_CONST( CString, m_pHand->m_vsReloadRowMessages, m )
 			MESSAGEMAN->Unsubscribe( this, *m );
 	}
-
 	m_pHand = NULL;
-
-	m_bFirstItemGoesDown = false;
 }
 
 void OptionRow::LoadNormal( const OptionRowDefinition &def, OptionRowHandler *pHand, bool bFirstItemGoesDown )

stepmania/src/OptionRow.h

@@ -114,7 +114,7 @@ public:
 		float fY,
 		const ThemeMetric<apActorCommands> &cmdLabelOn
 		);
-	void DetachHandler() { m_pHand = NULL; }
+	void DetachHandler();
 
 	void PositionUnderlines( bool bShowUnderlines, float fTweenSeconds );
 	void PositionIcons( const ThemeMetric1D<float> &fIconX, float fTweenSeconds );