bug#35702: xref revert-buffer

[Eli Zaretskii]

> Cc: 35702@debbugs.gnu.org, juri@linkov.net
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sat, 25 May 2019 19:14:39 +0300
> 
> On 25.05.2019 19:06, Eli Zaretskii wrote:
> > Thanks, but the purpose of my rant was not to follow up with
> > questions.  If I cannot convince you to clarify the code by adding
> > more comments, then I guess I failed, and let's drop this.
> 
> I was meaning to put at least some of the answers into comments.

Then I already asked those questions.  The most important one is what
values can the fetcher variable have, and in what situations (i.e.,
triggered by what command(s)) will we see each value.