[TD]fix fail to create vertex outside frame

src/Mod/TechDraw/Gui/QGTracker.cpp

@@ -273,6 +273,10 @@ void QGTracker::onDoubleClick(QPointF pos)
 
 void QGTracker::getPickedQGIV(QPointF pos)
 {
+    if (m_qgParent) {
+        return;
+    }
+
     setVisible(false);
     m_qgParent = nullptr;
     QList<QGraphicsView *> views = scene()->views();
@@ -284,13 +288,12 @@ void QGTracker::getPickedQGIV(QPointF pos)
         if (topItem != pickedItem) {
             pickedItem = topItem;
         }                               //pickedItem sb a QGIV
-        QGIView* qgParent = dynamic_cast<QGIView*>(pickedItem);
+        auto* qgParent = dynamic_cast<QGIView*>(pickedItem);
         if (qgParent) {
             m_qgParent = qgParent;
         }
     }
     setVisible(true);
-    return;
 }
 
 QRectF QGTracker::boundingRect() const
@@ -420,6 +423,7 @@ std::vector<Base::Vector3d> QGTracker::convertPoints()
 void QGTracker::terminateDrawing()
 {
     setCursor(Qt::ArrowCursor);
+    // should we care if m_qgParent is null?
     Q_EMIT drawingFinished(m_points, m_qgParent);
 }
 

src/Mod/TechDraw/Gui/QGTracker.h

@@ -95,6 +95,8 @@ public:
     void setTrackerMode(TrackerMode m) { m_trackerMode = m; }
     QPointF snapToAngle(QPointF pt);
 
+    void setOwnerQView(QGIView* owner) { m_qgParent = owner; }
+
 Q_SIGNALS:
     void drawingFinished(std::vector<QPointF> pts, TechDrawGui::QGIView* qgParent);
     void qViewPicked(QPointF pos, TechDrawGui::QGIView* qgParent);

src/Mod/TechDraw/Gui/TaskCosVertex.cpp

@@ -185,6 +185,9 @@ void TaskCosVertex::startTracker()
 
     if (!m_tracker) {
         m_tracker = new QGTracker(m_vpp->getQGSPage(), m_trackerMode);
+        std::string parentName = m_baseFeat->getNameInDocument();
+        QGIView* parentView = m_vpp->getQGSPage()->getQGIVByName(parentName);
+        m_tracker->setOwnerQView(parentView);
         QObject::connect(
             m_tracker, &QGTracker::drawingFinished,
             this, &TaskCosVertex::onTrackerFinished