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From: Eric Abrahamsen <eric@ericabrahamsen.net>
Newsgroups: gmane.emacs.devel
Subject: Re: Customize how xrefs are followed in help-mode?
Date: Fri, 17 May 2019 09:16:34 -0700
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Xref: news.gmane.org gmane.emacs.devel:236676
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Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> It's always bothered me that following a function/variable definition
>> button from a *Help* buffer goes to the file in a separate window -- I
>> almost always want to re-use the *Help* window.
>
> While it doesn't offer such a thing yet, it should be easy to extend
> `other-frame-window` to also offer a `ofw-same-window` prefix command,
> to solve this dilemma once and for all.

The last solution on #35487 is pretty concise, though...