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bug#29002: it.first_visible_x is erroneously 0 while horizontal scrollin

From: Eli Zaretskii
Subject: bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling.
Date: Sun, 29 Oct 2017 13:23:07 +0200 
> Date:  Thu, 26 Oct 2017 11:56:08 -0700
> From:  Keith David Bershatsky <esq@lawlist.com>
> Cc:  29002@debbugs.gnu.org
> 
> Unfortunately, w->min_hscroll returns a value of 0 in this example.

For the lines other than the current one, you should use
it.first_visible_x, it is simpler.  For the current line, use
w->hscroll.
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