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From: Eli Zaretskii <eliz@gnu.org>
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Subject: bug#45748: 28.0.50; fit-frame-to-buffer ignores leading spaces
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 (message from Aaron Jensen on Tue, 12 Jan 2021 22:34:42 -0600)
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> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Tue, 12 Jan 2021 22:34:42 -0600
> Cc: martin rudalics <rudalics@gmx.at>, 45748@debbugs.gnu.org
> 
> > On Sat, Jan 9, 2021 at 12:14 PM Eli Zaretskii <eliz@gnu.org> wrote:
> > > Yes, probably.
> > >
> > > But before we do any changes here, we need a test suite.  Would you
> > > mind adding the necessary tests to test/src/xdisp-tests.el?
> >
> > Okay, I added a few basic tests for this case. I don't know if that's
> > the best way to test it, but it's what I could figure out.
> > ...
> 
> Does this one look good to you?

Sorry, I didn't yet have time to take a good look at the changes.  I
will do that in a couple of days.