segmentation fault when closing with VST plugins open

Hi,

First off thanks for a great piece of software. I've noticed that the program segfaults on exit when VST plugins have their editor open, for example with the Aspect VST. It looks like this is because of multipe calls to closeEditor, the patch below appears to fix the problem, but I don't know if that is the "right" way to solve it.
Another weird exit-effect is that sometimes the program never exits, but gets stuck waiting on the qtractorAudioPeakFile::m_mutex, not sure what causes that...

--- qtractor-svn-update/src/qtractorVstPlugin.h	2014-07-31 06:48:58.231330252 +0200
+++ qtractor/src/qtractorVstPlugin.h	2014-08-04 18:46:03.576215203 +0200
@@ -172,6 +172,7 @@
 	// Parameter update method.
 	void updateParamValues(bool bUpdate);
 
+	bool closingEditor() { return m_closing_editor; }
 private:
 
 	// Instance variables.
@@ -183,6 +184,8 @@
 
 	// Our own editor widget (parent frame).
 	EditorWidget *m_pEditorWidget;
+
+	bool m_closing_editor;
 };
 
--- qtractor-svn-update/src/qtractorVstPlugin.cpp	2014-07-31 06:48:58.223330253 +0200
+++ qtractor/src/qtractorVstPlugin.cpp	2014-08-04 18:38:16.076226369 +0200
@@ -276,7 +276,7 @@
 
 		QWidget::closeEvent(pCloseEvent);
 
-		if (m_pVstPlugin)
+		if (m_pVstPlugin && !m_pVstPlugin->closingEditor())
 			m_pVstPlugin->closeEditor();
 	}
 
@@ -581,7 +581,7 @@
 qtractorVstPlugin::qtractorVstPlugin ( qtractorPluginList *pList,
 	qtractorVstPluginType *pVstType )
 	: qtractorPlugin(pList, pVstType), m_ppEffects(NULL),
-		m_ppIBuffer(NULL), m_ppOBuffer(NULL), m_pEditorWidget(NULL)
+		m_ppIBuffer(NULL), m_ppOBuffer(NULL), m_pEditorWidget(NULL), m_closing_editor(false)
 {
 #ifdef CONFIG_DEBUG
 	qDebug("qtractorVstPlugin[%p] filename=\"%s\" index=%lu typeHint=%d",
@@ -1005,6 +1005,7 @@
 // Close editor.
 void qtractorVstPlugin::closeEditor (void)
 {
+	m_closing_editor = true;
 	if (m_pEditorWidget == NULL)
 		return;