Make overlays-in treat zero-length overlays at point-max consistently

* doc/lispref/display.texi (Finding Overlays): Adjust documentation.

* src/buffer.c (overlays_in): Treat the end of the buffer and the
end of the narrowed-to buffer the same (bug#19422).
(Foverlays_in): Adjust doc string.

1 files changed, 8 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 54168e82660..3ccef6683a5 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -3080,6 +3080,14 @@ This is to keep the same behavior as Eshell.
 
 * Incompatible Lisp Changes in Emacs 28.1
 
++++
+** 'overlays-in' now handles zero-length overlays slightly differently.
+Previosly, zero-length overlays at the end of the buffer were included
+in the result (if the region queried for stopped at that position).
+The same was not the case if the buffer had been narrowed to exclude
+the real end of the buffer.  This has now been changed, and
+zero-length overlays at `point-max' are always included in the results.
+
 ---
 ** 'replace-match' now runs modification hooks slightly later.
 The function is documented to leave point after the replacement text,