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, 3 insertions, 2 deletions

diff --git a/src/buffer.c b/src/buffer.c
index b177c5eaa7f..7e4c84911bb 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2995,7 +2995,7 @@ overlays_in (EMACS_INT beg, EMACS_INT end, bool extend,
   ptrdiff_t next = ZV;
   ptrdiff_t prev = BEGV;
   bool inhibit_storing = 0;
-  bool end_is_Z = end == Z;
+  bool end_is_Z = end == ZV;
 
   for (struct Lisp_Overlay *tail = current_buffer->overlays_before;
        tail; tail = tail->next)
@@ -4268,9 +4268,10 @@ DEFUN ("overlays-in", Foverlays_in, Soverlays_in, 2, 2, 0,
        doc: /* Return a list of the overlays that overlap the region BEG ... END.
 Overlap means that at least one character is contained within the overlay
 and also contained within the specified region.
+
 Empty overlays are included in the result if they are located at BEG,
 between BEG and END, or at END provided END denotes the position at the
-end of the buffer.  */)
+end of the accessible part of the buffer.  */)
   (Lisp_Object beg, Lisp_Object end)
 {
   ptrdiff_t len, noverlays;