Code review comment for lp://staging/~vanvugt/mir/parenting-server-api

59 + virtual void set_parent(std::weak_ptr<Surface> const&, int id) = 0;

The int id needs to go away.

"Alternatively, we could clean it up by adding an id() to scene::Surface, but I think that's unnecessary, more complex, and would be equally easy to abuse."

Why would that be equally easy to abuse? Ids for a surface would be created at construction time and never change.

" Because "parent" then became effectively not a surface attribute any more."

Perhaps that's a strong hint that it isn't then.

So I think the path to resolve this "needs fixing" is indeed to ad an id to Surface.