Fix line number display after 'widen'

* src/xdisp.c (maybe_produce_line_number): Don't use data cached
by line-number-mode on the first redisplay after the buffer is
widened.  (Bug#28879)

1 files changed, 4 insertions, 2 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index b14b7daf2b0..6d9acecb424 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -20889,9 +20889,11 @@ maybe_produce_line_number (struct it *it)
               && it->w->base_line_pos <= IT_CHARPOS (*it)
               /* line-number-mode always displays narrowed line
                  numbers, so we cannot use its data if the user wants
-                 line numbers that disregard narrowing.  */
+                 line numbers that disregard narrowing, or if the
+                 buffer's narrowing has just changed.  */
               && !(display_line_numbers_widen
-                   && (BEG_BYTE != BEGV_BYTE || Z_BYTE != ZV_BYTE)))
+                   && (BEG_BYTE != BEGV_BYTE || Z_BYTE != ZV_BYTE))
+              && !current_buffer->clip_changed)
             {
               start_from = CHAR_TO_BYTE (it->w->base_line_pos);
               last_line = it->w->base_line_number - 1;