[TD]fix disappearing balloon cursor

src/Mod/TechDraw/Gui/QGVNavStyleCAD.cpp

@@ -83,7 +83,8 @@ void QGVNavStyleCAD::handleMousePressEvent(QMouseEvent *event)
 void QGVNavStyleCAD::handleMouseMoveEvent(QMouseEvent *event)
 {
     if (getViewer()->isBalloonPlacing()) {
-        getViewer()->setBalloonCursorPos(event->pos());
+        balloonCursorMovement(event);
+        return;
     }
 
     //if the mouse moves between press and release, then it isn't a click