Don't look for long lines beyond the narrowed region

* src/xdisp.c (redisplay_window): Don't scan for newlines outside
the current buffer's restriction.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index 0248e8e53f1..03c43be5bc0 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -19589,7 +19589,7 @@ redisplay_window (Lisp_Object window, bool just_this_one_p)
     {
       ptrdiff_t cur, next, found, max = 0, threshold;
       threshold = XFIXNUM (Vlong_line_threshold);
-      for (cur = BEG; cur < Z; cur = next)
+      for (cur = BEGV; cur < ZV; cur = next)
         {
           next = find_newline1 (cur, CHAR_TO_BYTE (cur), 0, -1, 1,
                                 &found, NULL, true);