Re: Fix some tooltip related problems

[Eli Zaretskii]

> Date: Mon, 08 Jan 2018 20:06:17 +0100
> From: martin rudalics <address@hidden>
> CC: address@hidden
> 
>  > What would that do to Lisp code that was probing that frame parameter?
>  > I think for backward compatibility we should pretend in
>  > frame-parameters and frame-parameter that this parameter still exist,
>  > at least for tooltip frames.
>  >
>  > IOW, remove it only for internal bookkeeping.
> 
> How about adding it to `tooltip-frame-parameters' then?

I don't mind, but what I meant was to allow Lisp code written to
manipulate tooltips to be able to find the 'tooltip' frame parameter
when calling frame-parameter(s) for the tooltip frames.  This should
preferably happen even if some code removes that parameter from
tooltip-frame-parameters.