Gui: Disallow dragging features outside of body

src/Mod/PartDesign/Gui/ViewProviderBody.cpp

@@ -453,3 +453,13 @@ void ViewProviderBody::dropObject(App::DocumentObject* obj)
         }
     }
 }
+bool ViewProviderBody::canDragObjectToTarget(App::DocumentObject* obj,
+                                             App::DocumentObject* target) const
+{
+    if (obj->isDerivedFrom<PartDesign::Feature>()) {
+        return target && target->is<PartDesign::Body>();
+    }
+
+    return ViewProviderPart::canDragObjectToTarget(obj, target);
+}
+

src/Mod/PartDesign/Gui/ViewProviderBody.h

@@ -88,6 +88,7 @@ public:
     bool canDropObject(App::DocumentObject*) const override;
     /** Add an object to the view provider by drag and drop */
     void dropObject(App::DocumentObject*) override;
+    bool canDragObjectToTarget(App::DocumentObject* obj, App::DocumentObject* target) const override;
 
 protected:
     /// Copy over all visual properties to the child features