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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 18:50:10 +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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In-reply-to: <258D76F0-A2AD-461F-8257-636908A57F85@gmail.com> (message from
 Yuan Fu on Sat, 18 Jan 2020 10:41:56 -0500)
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> From: Yuan Fu <casouri@gmail.com>
> Date: Sat, 18 Jan 2020 10:41:56 -0500
> Cc: martin rudalics <rudalics@gmx.at>,
>  emacs-devel <emacs-devel@gnu.org>,
>  monnier@iro.umontreal.ca,
>  juri@linkov.net
> 
> - emacs -q
> - (setq gdb-many-windows t) / or (setq gdb-show-main t)
> - maximize frame
> - M-x gdb
> - make room for source window. Make the source window span the whole width of Emacs frame works for both layout.
> - step until gdb steps into a function in another file

I still cannot reproduce this, even with this recipe, sorry.  But
maybe I don't understand what you mean by "make room for source
window"?