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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Extend gdb to filter registers
Date: Sat, 18 Jan 2020 13:15:49 +0200
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Cc: rudalics@gmx.at, juri@linkov.net, monnier@iro.umontreal.ca,
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To: Yuan Fu <casouri@gmail.com>
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 (message from Yuan Fu on Thu, 16 Jan 2020 10:04:00 -0500)
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> From: Yuan Fu <casouri@gmail.com>
> Date: Thu, 16 Jan 2020 10:04:00 -0500
> Cc: martin rudalics <rudalics@gmx.at>, Emacs developers <emacs-devel@gnu.org>, 
> 	Stefan Monnier <monnier@iro.umontreal.ca>, Juri Linkov <juri@linkov.net>
> 
> a.c:
> 
> int f1(int a) {
>     return a + 1;
> }
> 
> b.c:
> 
> #include "a.c"
> 
> int main() {
>     int b = f1(1);
>     int c = 0;
>     return b + c;
> }
> 
> Steps:
> - M-x gdb
> - b main
> - r
> - s (many times)
> 
> And when you step into f1 which is in a.c, gdb opens another window to display it (again, if your screen is
> large enough).

I cannot reproduce this even if I maximize my Emacs frame before
invoking "M-x gdb".  I always get the source in the same window.  I
used your example.  My screen is 1920x1080 pixels, if that's
important.

So I wonder what other factors could be at work here.