Merge pull request #12306 from Rexbas/fix-disappearing-handles

Gui: Fix disappearing element handles in sketcher

src/Gui/View3DInventorViewer.cpp

@@ -1057,6 +1057,7 @@ void View3DInventorViewer::setEditingViewProvider(Gui::ViewProvider* vp, int Mod
 {
     this->editViewProvider = vp;
     this->editViewProvider->setEditViewer(this, ModNum);
+    this->navigation->findBoundingSphere();
     addEventCallback(SoEvent::getClassTypeId(), Gui::ViewProvider::eventCallback,this->editViewProvider);
 }