privatize

GUI/Model/Device/InstrumentsSet.h

@@ -43,8 +43,6 @@ public:
     void writeTo(QXmlStreamWriter* w) const;
     void readFrom(QXmlStreamReader* r);
 
-    void emplace_back(InstrumentItem* item); // TODO Qt6 emplace
-
     //! Inserts a deep copy (also of any non XML data in a pointwise axis)
     //! The id will not be copied, but a new unique one will be created
     //! Returns the newly created instrument.
@@ -78,6 +76,8 @@ signals:
     void instrumentNameChanged(const InstrumentItem* instrument) const;
 
 private:
+    void emplace_back(InstrumentItem* item);
+
     PolyVector<InstrumentsCatalog> m_instruments;
     int m_current_index = -1;
 };