resolved new-project bug: no more duplications

GUI/View/List/InstrumentsQListView.cpp

@@ -25,7 +25,6 @@
 #include "GUI/View/Widget/ItemViewOverlayButtons.h"
 #include "GUI/View/Widget/ListItemDelegate.h"
 #include <QMessageBox>
-#include <QThread>
 
 InstrumentsQListView::InstrumentsQListView()
     : m_model(new InstrumentsQModel)
@@ -66,6 +65,7 @@ InstrumentsQListView::InstrumentsQListView()
         emit gDoc->instruments()->setChanged();
     });
 
+    disconnect(gDoc->instruments(), &InstrumentsSet::setChanged, nullptr, nullptr);
     connect(gDoc->instruments(), &InstrumentsSet::setChanged, [this] {
         setCurrentIndex(m_model->index(gDoc->instruments()->currentIndex(), 0));
         repaint();
@@ -74,6 +74,12 @@ InstrumentsQListView::InstrumentsQListView()
     setContextMenuPolicy(Qt::ActionsContextMenu);
 }
 
+InstrumentsQListView::~InstrumentsQListView()
+{
+    disconnect(this, nullptr, nullptr, nullptr);
+    delete m_model;
+}
+
 QSize InstrumentsQListView::sizeHint() const
 {
     return {170, 400};

GUI/View/List/InstrumentsQListView.h

@@ -26,6 +26,7 @@ class InstrumentsQListView : public QListView {
     Q_OBJECT
 public:
     InstrumentsQListView();
+    ~InstrumentsQListView();
 
     QSize sizeHint() const override;
     QSize minimumSizeHint() const override;