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From: Eric Abrahamsen <eric@ericabrahamsen.net>
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Subject: Re: gnus-group-change-level-function could be a hook
Date: Fri, 19 Jul 2019 12:19:18 -0700
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dick.r.chiang@gmail.com writes:

> gnus-topic-mode overrides my setting of gnus-group-change-level-function.
> It'd be nice to have it be a hook.

Much of the topic functionality comes from overriding local variables to
use topic-specific functions. I think it would be a heck of a lot of
work to switch all those to hooks; I'm not even sure it would be
possible. Could you re-set that variable in the `gnus-topic-mode-hook'?
You'd have to make sure your function more or less replicated what the
topic-specific function was doing...