InstrumentTrack: hide sound shaping widgets for single-streamed instruments

We currently don't apply envelopes/LFOs and filters to single-streamed
instruments, therefore hide the GUI.

include/InstrumentSoundShapingView.h

@@ -44,6 +44,8 @@ public:
 	InstrumentSoundShapingView( QWidget * _parent );
 	virtual ~InstrumentSoundShapingView();
 
+	void setFunctionsHidden( bool hidden );
+
 
 private:
 	virtual void modelChanged();

src/gui/widgets/InstrumentSoundShapingView.cpp

@@ -127,6 +127,13 @@ InstrumentSoundShapingView::~InstrumentSoundShapingView()
 
 
 
+void InstrumentSoundShapingView::setFunctionsHidden( bool hidden )
+{
+	m_targetsTabWidget->setHidden( hidden );
+	m_filterGroupBox->setHidden( hidden );
+}
+
+
 
 void InstrumentSoundShapingView::modelChanged()
 {

src/tracks/InstrumentTrack.cpp

@@ -1408,6 +1408,8 @@ void InstrumentTrackWindow::updateInstrumentView()
 		m_tabWidget->addTab( m_instrumentView, tr( "PLUGIN" ), 0 );
 		m_tabWidget->setActiveTab( 0 );
 
+		m_ssView->setFunctionsHidden( m_track->m_instrument->flags().testFlag( Instrument::IsSingleStreamed ) );
+
 		modelChanged(); 		// Get the instrument window to refresh
 		m_track->dataChanged(); // Get the text on the trackButton to change
 	}