Code review comment for lp://staging/~albaguirre/mir/dialogs_and_tooltips

> Firstly, spec questions:
> *) Huh. Why do the docs allow the client to specify the location of a dialog‽
> That's surely an error.
It actually mentions a client specifying an optional initial position for more than dialogs so yeah doesn't belong in this dialog API.

> *) Relatedly, the spec is inconsistent on whether or not dialogs can have
> dialog children.
I could only find one sentence where it's inconsistent. However there's a full paragraph with motivation for avoiding trees of dialogs

> Again, we need to specify input behaviour of tooltips.
>
> And maybe something about the input behaviour of modal dialogs, but that's
> less complicated.
>
I added a bit of info there.

> I lean towards having two spec creation functions; _spec_for_dialog_surface
> and _spec_for_modal_dialog_surface, *particularly* if we really do need to
> allow client-specified positioning of modal dialogs. _spec_for_dialog_surface
> has half the parameters of _spec_for_modal_dialog_surface.

I think it makes sense to split them, done.

> Relatedly, I wonder if we should drop the “_surface” from
> mir_connection_create_spec_for_*_surface? They're getting a bit long.

Dropped.