0027959: BRepMesh_Delaun produces mesh with gaps on internal edges

Check both sides of internal link for adjusted triangle and process left and right polygons separately
Small correction of test case for issue CR27959

src/BRepMesh/BRepMesh_Delaun.hxx

@@ -320,6 +320,9 @@ private:
                           const Standard_Integer             theStartIndex,
                           const Standard_Integer             theEndIndex) const;
 
+  //! Performs insertion of internal edges into mesh.
+  void insertInternalEdges();
+
 private:
 
   Handle(BRepMesh_DataStructureOfDelaun) myMeshData;