[TD]fix uncommanded leader position change

src/Mod/TechDraw/Gui/QGIView.cpp

@@ -228,6 +228,10 @@ QVariant QGIView::itemChange(GraphicsItemChange change, const QVariant &value)
 
     return QGraphicsItemGroup::itemChange(change, value);
 }
+
+//! The default behaviour here only applies to views whose (X, Y) describes a position on the page.
+//! Others, like QGILeaderLine whose (X, Y) describes a position within a view's boundary and is not
+//! draggable, should override this method.
 void QGIView::dragFinished()
 {
     if (!viewObj) {