bug#21777: 25.0.50; gud-gdb uses a pager, which is harmful inside emacs

[Eli Zaretskii]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Lars Ingebrigtsen <larsi@gnus.org>,  dima@secretsauce.net,
>   21777@debbugs.gnu.org
> Date: Tue, 22 Sep 2020 18:19:54 +0200
> 
> On Sep 22 2020, Eli Zaretskii wrote:
> 
> > That's a different problem, then.  I think it is related to
> > window-adjust-process-window-size-function and
> > set-process-window-size, introduced in Emacs 25.  I guess gud-gdb
> > should disable that feature.
> 
> It's really a bug in gdb, as just sending SIGWINCH to gdb will trigger
> this.

So you are saying that when INSIDE_EMACS is set, GDB should disable
the Readline's SIGWINCH handler?