TechDraw: Fix balloon annotation unlinked after undo-redo (#22805)

* TechDraw: remove then add balloon annotation when changing the SourceView

* Use fixSceneDependencies

src/Mod/TechDraw/App/DrawViewBalloon.h

@@ -82,6 +82,8 @@ public:
 
     Base::Vector3d getOriginOffset() const;
 
+    App::PropertyLink *getOwnerProperty() override { return &SourceView; }
+
 protected:
     void onChanged(const App::Property* prop) override;
     void handleChangedPropertyType(Base::XMLReader& reader, const char* TypeName,

src/Mod/TechDraw/Gui/ViewProviderBalloon.cpp

@@ -48,6 +48,7 @@
 #include "QGIViewBalloon.h"
 #include "TaskBalloon.h"
 #include "ViewProviderBalloon.h"
+#include "ViewProviderPage.h"
 
 using namespace TechDrawGui;
 using namespace TechDraw;
@@ -115,12 +116,18 @@ void ViewProviderBalloon::updateData(const App::Property* prop)
     //Balloon handles X, Y updates differently that other QGIView
     //call QGIViewBalloon::updateView
     if (prop == &(getViewObject()->X)  ||
-        prop == &(getViewObject()->Y) ){
+        prop == &(getViewObject()->Y)){
         QGIView* qgiv = getQView();
         if (qgiv) {
             qgiv->updateView(true);
         }
     }
+    if (prop == &(getViewObject()->SourceView)) {
+        // Ensure the QGraphicsItems hierarchy matches the DocumentObject's
+        if (ViewProviderPage* vpp = getViewProviderPage()) {
+            vpp->fixSceneDependencies();
+        }
+    }
 
     //Skip QGIView X, Y processing - do not call ViewProviderDrawingView
     Gui::ViewProviderDocumentObject::updateData(prop);

src/Mod/TechDraw/Gui/ViewProviderDrawingView.cpp

@@ -172,7 +172,6 @@ void ViewProviderDrawingView::hide()
         }
     }
 }
-
 QGIView* ViewProviderDrawingView::getQView()
 {
     TechDraw::DrawView* dv = getViewObject();
@@ -190,8 +189,9 @@ QGIView* ViewProviderDrawingView::getQView()
         return nullptr;
     }
 
-    if (vpp->getQGSPage()) {
-        return dynamic_cast<QGIView *>(vpp->getQGSPage()->findQViewForDocObj(getViewObject()));
+    QGSPage* page = vpp->getQGSPage();
+    if (page) {
+        return dynamic_cast<QGIView *>(page->findQViewForDocObj(getViewObject()));
     }
 
     return nullptr;