bug#39977: 28.0.50; Unhelpful stack trace

[Eli Zaretskii]

> Cc: enometh@meer.net, 39977@debbugs.gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Tue, 17 Mar 2020 18:31:18 +0100
> 
>  > You are proposing that we find all the places where SELECTED_FRAME is
>  > used and fix them one by one?  I thought it could be better to fix
>  > them all at once as part of SELECTED_FRAME.
> 
> We are still miscommunicating.  I only want to fix the parts that
> restore selected_frame so to make sure that they never set it to a dead
> frame.

Why?