bug#23809: 24.5; Positive argument to 'posn-at-point' throws erros as being negative

[Eli Zaretskii]

> Date: Wed, 22 Jun 2016 08:10:44 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: vilanova@ac.upc.edu, 23809@debbugs.gnu.org
> 
>  > I don't like sweeping problems under the carpet.  We should understand
>  > how come we get negative pixel coordinates in these cases, it's most
>  > likely some bug in pos_visible_p or somesuch.
> 
> A ‘condition-case’ would fix the problem on the release branch and give
> you all the time to find the real cause.

the problem doesn't seem grave enough to rush with a solution.

> Also, unless we guard against ‘posn-at-point’ ever returning a
> negative y-value, there's no guarantee that finding the cause of the
> present problem will fix this issue once and for all.

We will cross that bridge when we get to it.

Thanks.