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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Collapse all include lines?
Date: Sat, 14 May 2022 09:21:32 +0300
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 (message from John Yates on Fri, 13 May 2022 18:28:49 -0400)
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> From: John Yates <john@yates-sheets.org>
> Date: Fri, 13 May 2022 18:28:49 -0400
> 
> At work we have opted to apply Google's IWYU
> (Include What You Use).  This leads much longer
> lists of includes.
> 
> Is that a package that will let me initially collapse,
> but optionally expand, an expanse of #include and
> blank lines?

Did you look at hideif.el?