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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Calculating screen relative X when horizontal scrolling.
Date: Fri, 19 Oct 2018 22:23:34 +0300
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In-reply-to: <m2zhvctibe.wl%esq@lawlist.com> (message from Keith David
	Bershatsky on Wed, 17 Oct 2018 13:43:49 -0700)
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> Date:  Wed, 17 Oct 2018 13:43:49 -0700
> From:  Keith David Bershatsky <esq@lawlist.com>
> Cc:  emacs-devel@gnu.org
> 
> relative_x = it->current_x - ((window_hscroll_limited (it->w, it->f) * FRAME_COLUMN_WIDTH (it->f))

Can you tell why you don't use the simple approach:

  relative_x = it->current_x - it->first_visible_x;

?