update instruments list after change of name

GUI/Model/Type/SetWithModel.h

@@ -102,6 +102,13 @@ public:
         emit AbstractSetModel::setChanged();
     }
 
+    //! To be called when name or description of the current item have changed.
+    void currentDataChanged()
+	{
+	    QModelIndex qi = m_qmodel->index(m_idx, 0);
+	    m_qmodel->dataChanged(qi, qi, QVector<int>({Qt::DisplayRole, Qt::EditRole}));
+	}
+
     size_t currentIndex() const { return m_idx; }
     const T* currentItem() const { return m_idx < m_vec.size() ? m_vec.at(m_idx) : (T*)nullptr; }
     T* currentItem() { return m_idx < m_vec.size() ? m_vec.at(m_idx) : (T*)nullptr; }
@@ -135,6 +142,7 @@ public:
     QAbstractListModel* model() override { return m_qmodel.get(); }
 
 private:
+    //! To be called when m_idx may have fallen out of range.
     void update_current()
     {
         if (m_idx == m_vec.size())

GUI/View/Views/InstrumentView.cpp

@@ -168,7 +168,7 @@ QWidget* InstrumentView::createEditor(InstrumentItem* t)
     connect(nameEdit, &QLineEdit::textEdited, [this, t](const QString& text) {
         if (text != t->name()) {
             t->setName(text);
-            emit m_set->setChanged();
+            m_set->currentDataChanged();
         }
     });
     formLayout->addRow("Name:", nameEdit);
@@ -181,7 +181,7 @@ QWidget* InstrumentView::createEditor(InstrumentItem* t)
     descriptionEdit->setPlainText(t->description());
     connect(descriptionEdit, &QTextEdit::textChanged, [this, t, descriptionEdit] {
         t->setDescription(descriptionEdit->toPlainText());
-        emit m_set->setChanged();
+        m_set->currentDataChanged();
     });
     formLayout->addRow("Description:", descriptionEdit);