Avoid vfunc in cellrenderer
As suggested by the maintainer of pygobject for #7541 (closed), it is better to avoid to use vfunc if possible. review66371002 does that for the cellrenderer.
As suggested by the maintainer of pygobject for #7541 (closed), it is better to avoid to use vfunc if possible. review66371002 does that for the cellrenderer.