rm Session-Property, use simple QString

easily possible because ParameterItem is not stored by SessionModel means any more

GUI/Model/Fit/ParameterTreeItems.cpp

@@ -42,11 +42,7 @@ ParameterLabelItem::ParameterLabelItem() : SessionItem(M_TYPE)
 
 // ----------------------------------------------------------------------------
 
-ParameterItem::ParameterItem() : SessionItem(M_TYPE)
-{
-    // Link to original PropertyItem in one of components of MultiLayerItem or InstrumentItem
-    addProperty(P_LINK, QString());
-}
+ParameterItem::ParameterItem() : SessionItem(M_TYPE) {}
 
 //! Sets current value to the original PropertyItem of MultiLayerItem/InstrumentItem.
 
@@ -64,18 +60,18 @@ SessionItem* ParameterItem::linkedItem()
 {
     const SessionItem* jobItem = GUI::Model::Path::ancestor(this, JobItem::M_TYPE);
     ASSERT(jobItem);
-    QString link = jobItem->itemName() + "/" + getItemValue(P_LINK).toString();
+    QString link = jobItem->itemName() + "/" + m_link;
     return model()->itemForIndex(GUI::Model::Path::getIndexFromPath(model(), link));
 }
 
 void ParameterItem::setLink(const QString& link)
 {
-    setItemValue(P_LINK, link);
+    m_link = link;
 }
 
 QString ParameterItem::link() const
 {
-    return getItemValue(P_LINK).toString();
+    return m_link;
 }
 
 // ----------------------------------------------------------------------------

GUI/Model/Fit/ParameterTreeItems.h

@@ -33,9 +33,6 @@ public:
 //! The ParameterItem class represent a tuning value in a parameter tuning tree.
 
 class ParameterItem : public SessionItem {
-private:
-    static constexpr auto P_LINK{"Link"};
-
 public:
     static constexpr auto M_TYPE{"Parameter"};
 
@@ -45,6 +42,9 @@ public:
     SessionItem* linkedItem();
     void setLink(const QString& link);
     QString link() const;
+
+private:
+    QString m_link; //!< Link to original PropertyItem
 };
 
 //! The ParameterContainerItem is a top item to hold all ParameterItem, represents an entry