From: Eli Zaretskii <eliz@gnu.org>
Date: Fri, 14 Jul 2017 08:00:25 +0000 (+0300)
Subject: Add assertion related to display-line-numbers
X-Git-Tag: emacs-26.0.90~518^2~118
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=037d8bdfeb905f0f1f49c5c7ab2deba13c9c6617;p=emacs.git

Add assertion related to display-line-numbers

* src/xdisp.c (maybe_produce_line_number): Add assertion for the
condition regarding IT->glyph_row->used[TEXT_AREA] expected by the
code.  (Bug#27668)
---

diff --git a/src/xdisp.c b/src/xdisp.c
index 85b9eae36d1..2aceb89c003 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -21009,6 +21009,8 @@ maybe_produce_line_number (struct it *it)
   struct glyph *p = it->glyph_row ? it->glyph_row->glyphs[TEXT_AREA] : NULL;
   short *u = it->glyph_row ? &it->glyph_row->used[TEXT_AREA] : NULL;
 
+  eassert (it->glyph_row == NULL || it->glyph_row->used[TEXT_AREA] == 0);
+
   for ( ; g < e; g++)
     {
       it->current_x += g->pixel_width;