bug#24109: 24.5; Long lines in message mode make Emacs irresponsive

[Eli Zaretskii]

> Date: Sat, 30 Jul 2016 19:01:17 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: 24109@debbugs.gnu.org, djcb@djcbsoftware.nl
> 
>  > I must be blind, because they do seem aligned to the left.  Could you
>  > please point to the header that isn't?
> 
> The subject header?

Which subject header?

>  > I understand, but the backtrace doesn't show anything unusual.  All I
>  > see is Emacs's display engine merging faces for displaying some buffer
>  > text.
> 
> Maybe I'm silly but
> 
> #0  assq_no_quit (key=key@entry=16848, list=51100227) at fns.c:1452
> #1  0x00000000004b24ac in lface_from_face_name_no_resolve 
> (f=f@entry=0x1237f90, face_name=face_name@entry=16848, 
> signal_p=signal_p@entry=false) at xfaces.c:1862
> 
> sounds fishy to me.

Please explain why.

> But the alignment issue and the assq_no_quit one seem completely
> unrelated to me.

That's my guess as well.