do not show F2 as short cuts for renaming on macOS as it doesn't work

src/Gui/DAGView/DAGModel.cpp

@@ -133,7 +133,9 @@ Model::Model(QObject *parentIn, const Gui::Document &documentIn) : QGraphicsScen
   renameAction = new QAction(this);
   renameAction->setText(tr("Rename"));
   renameAction->setStatusTip(tr("Rename object"));
+#ifndef Q_OS_MAC
   renameAction->setShortcut(Qt::Key_F2);
+#endif
   connect(renameAction, SIGNAL(triggered()), this, SLOT(onRenameSlot()));
   
   editingFinishedAction = new QAction(this);

src/Gui/Tree.cpp

@@ -82,7 +82,9 @@ TreeWidget::TreeWidget(QWidget* parent)
     this->relabelObjectAction = new QAction(this);
     this->relabelObjectAction->setText(tr("Rename"));
     this->relabelObjectAction->setStatusTip(tr("Rename object"));
+#ifndef Q_OS_MAC
     this->relabelObjectAction->setShortcut(Qt::Key_F2);
+#endif
     connect(this->relabelObjectAction, SIGNAL(triggered()),
             this, SLOT(onRelabelObject()));