From: Gregory Heytings <gregory@heytings.org>
Date: Tue, 19 Jul 2022 13:33:38 +0000 (+0000)
Subject: Improve the heuristic for long lines detection again.
X-Git-Tag: emacs-29.0.90~1447^2~821^2~4
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=9a894206f6;p=emacs.git

Improve the heuristic for long lines detection again.

* src/xdisp.c (redisplay_window): Improve the heuristic again.
---

diff --git a/src/xdisp.c b/src/xdisp.c
index 05fb008ff15..ee34487a444 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -19294,7 +19294,9 @@ redisplay_window (Lisp_Object window, bool just_this_one_p)
   /* Check whether the buffer to be displayed contains long lines.  */
   if (!NILP (Vlong_line_threshold)
       && !current_buffer->long_line_optimizations_p
-      && Z - BEG - BUF_UNCHANGED_SIZE (current_buffer) <= 1)
+      && (MODIFF - UNCHANGED_MODIFIED > 4
+	  || Z - BEG - BUF_UNCHANGED_SIZE (current_buffer) > 1
+	  || Z - BEG - BUF_UNCHANGED_SIZE (current_buffer) < -1))
     {
       ptrdiff_t cur, next, found, max = 0;
       for (cur = 1; cur < Z; cur = next)