From: Eli Zaretskii <eliz@gnu.org>
Date: Mon, 16 Oct 2017 15:51:32 +0000 (+0300)
Subject: Fix 'line-number-display-width' in hscrolled windows
X-Git-Tag: emacs-26.0.91~540
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=081d2187c4;p=emacs.git

Fix 'line-number-display-width' in hscrolled windows

* src/indent.c (line_number_display_width): Make sure a line
number is generated even when the first line of the window is
completely hscrolled out of view.  (Bug#28854)
---

diff --git a/src/indent.c b/src/indent.c
index 26507b5eb5b..be8676600a5 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -1974,6 +1974,11 @@ line_number_display_width (struct window *w, int *width, int *pixel_width)
 	  saved_restriction = true;
 	}
       start_display (&it, w, wstart);
+      /* The call to move_it_by_lines below will not generate a line
+	 number if the first line shown in the window is hscrolled
+	 such that all of its display elements are out of view.  So we
+	 pretend the hscroll doesn't exist.  */
+      it.first_visible_x = 0;
       move_it_by_lines (&it, 1);
       *width = it.lnum_width;
       *pixel_width = it.lnum_pixel_width;