[Sketcher] Make replaceGeometries protected

This should be a `protected` or `private` operation since it doesn't handle
constraints. However, this is intended to be used by external classes that
modify a `SketchObject` (instead of these modifications like `split`, `trim`,
`join` etc. being methods of `SketchObject`). In that case, it may be best to
use the `friend` keyword.

src/Mod/Sketcher/App/SketchObject.h

@@ -173,10 +173,6 @@ public:
     int addConstraint(std::unique_ptr<Constraint> constraint);
     /// delete constraint
     int delConstraint(int ConstrId);
-    /// Replaces geometries at `oldGeoIds` with `newGeos`, lower Ids first.
-    /// If `oldGeoIds` is bigger, deletes the remaining.
-    /// If `newGeos` is bigger, adds the remaining geometries at the end.
-    void replaceGeometries(std::vector<int> oldGeoIds, std::vector<Part::Geometry*>& newGeos);
     /** deletes a group of constraints at once, if norecomputes is active, the default behaviour is
      * that it will solve the sketch.
      *
@@ -905,6 +901,12 @@ protected:
     /// get called by the container when a property has changed
     void onChanged(const App::Property* /*prop*/) override;
 
+    /// Replaces geometries at `oldGeoIds` with `newGeos`, lower Ids first.
+    /// If `oldGeoIds` is bigger, deletes the remaining.
+    /// If `newGeos` is bigger, adds the remaining geometries at the end.
+    /// NOTE: Does NOT move any constraints
+    void replaceGeometries(std::vector<int> oldGeoIds, std::vector<Part::Geometry*>& newGeos);
+
     /// Helper functions for `deleteUnusedInternalGeometry` by cases
     /// two foci for ellipses and arcs of ellipses and hyperbolas
     int deleteUnusedInternalGeometryWhenTwoFoci(int GeoId, bool delgeoid = false);