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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Problems with move_it_in_display_line_to X when tabs exist.
Date: Mon, 04 Dec 2017 17:48:37 +0200
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To: Keith David Bershatsky <esq@lawlist.com>
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In-reply-to: <m2indnh6ni.wl%esq@lawlist.com> (message from Keith David
	Bershatsky on Sun, 03 Dec 2017 12:56:49 -0800)
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> Date:  Sun, 03 Dec 2017 12:56:49 -0800
> From:  Keith David Bershatsky <esq@lawlist.com>
> Cc:  emacs-devel@gnu.org
> 
> For the issue to be present, the tab STRETCH must _visibly_ be 2 columns wide _and_ the tab CHARACTER must be 1 column wide, for a grand total of 3 columns.  The variable tab-width is exactly 2.  The preceding long line must have a space at the window edge; and, the following line contains a second word with just "xxx", a tab, followed by some letters like "hello-world".

That's exactly what I did.