Only update infobox if the mouse is pressed

src/plugins/qmldesigner/components/formeditor/formeditorgraphicsview.cpp

@@ -112,6 +112,8 @@ void FormEditorGraphicsView::mouseReleaseEvent(QMouseEvent *event)
         QGraphicsView::mouseReleaseEvent(mouseEvent);
         delete mouseEvent;
     }
+
+    m_feedbackOriginPoint = QPoint();
 }
 
 void FormEditorGraphicsView::drawForeground(QPainter *painter, const QRectF &/*rect*/ )
@@ -119,6 +121,9 @@ void FormEditorGraphicsView::drawForeground(QPainter *painter, const QRectF &/*r
     if (!m_feedbackNode.isValid())
         return;
 
+    if (m_feedbackOriginPoint.isNull())
+        return;
+
     painter->save();
 
     painter->resetTransform();