New variable 'expose-hidden-buffer' (Bug#75828)

* src/frame.c (make_frame): Handle 'expose-hidden-buffer'.
(expose-hidden-buffer): New variable to handle hidden buffers.
* src/buffer.c (Fother_buffer): Mention that it does not return
a hidden buffer.
* lisp/frame.el (make-frame): In doc-string describe handling
of hidden buffers.
* doc/lispref/frames.texi (Creating Frames): Explain handling
of hidden buffers in description of 'make-frame'.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 1b9092b107b..ed2f14ea9c0 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1729,7 +1729,8 @@ Buffers not visible in windows are preferred to visible buffers, unless
 optional second argument VISIBLE-OK is non-nil.  Ignore the argument
 BUFFER unless it denotes a live buffer.  If the optional third argument
 FRAME specifies a live frame, then use that frame's buffer list instead
-of the selected frame's buffer list.
+of the selected frame's buffer list.  Do not return a hidden buffer - a
+buffer whose name starts with a space.
 
 The buffer is found by scanning the selected or specified frame's buffer
 list first, followed by the list of all buffers.  If no other buffer