From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 9 Jul 2022 10:26:05 +0000 (+0300)
Subject: Avoid assertion violations in 'back_to_previous_visible_line_start'
X-Git-Tag: emacs-29.0.90~1447^2~821^2~14
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=9de00e5fda2e04316357bd8cf0d8094c63ff171b;p=emacs.git

Avoid assertion violations in 'back_to_previous_visible_line_start'

* src/xdisp.c (back_to_previous_visible_line_start): Avoid
assertion violations when narrowed_begv is in effect.
---

diff --git a/src/xdisp.c b/src/xdisp.c
index 84203f0ed0c..ac76917eb3f 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -7226,7 +7226,8 @@ back_to_previous_visible_line_start (struct it *it)
   it->continuation_lines_width = 0;
 
   eassert (IT_CHARPOS (*it) >= BEGV);
-  eassert (IT_CHARPOS (*it) == BEGV
+  eassert (it->narrowed_begv > BEGV
+	   || IT_CHARPOS (*it) == BEGV
 	   || FETCH_BYTE (IT_BYTEPOS (*it) - 1) == '\n');
   CHECK_IT (it);
 }