Make `line-number-at-pos' work more like in earlier Emacs versions

* src/fns.c (Fline_number_at_pos): Allow calling with position
outside the region if called with ABSOLUTE non-nil (bug#55847).
This isn't announced in the doc string, but makes function
compatible with the version in earlier Emacs versions.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/fns.c b/src/fns.c
index 2c206c62b22..fceab9ba0ca 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -5869,9 +5869,12 @@ from the absolute start of the buffer, disregarding the narrowing.  */)
   if (!NILP (absolute))
     start = BEG_BYTE;
 
-  /* Check that POSITION is in the accessible range of the buffer. */
-  if (pos < BEGV || pos > ZV)
+  /* Check that POSITION is in the accessible range of the buffer, or,
+     if we're reporting absolute positions, in the buffer. */
+  if (NILP (absolute) && (pos < BEGV || pos > ZV))
     args_out_of_range_3 (make_int (pos), make_int (BEGV), make_int (ZV));
+  else if (!NILP (absolute) && (pos < 1 || pos > Z))
+    args_out_of_range_3 (make_int (pos), make_int (1), make_int (Z));
 
   return make_int (count_lines (start, CHAR_TO_BYTE (pos)) + 1);
 }