Add 'ring-resize' function

* lisp/emacs-lisp/ring.el (ring-resize): New function.  (Bug#32849)
* doc/lispref/sequences.texi (Rings): Document new function 'ring-resize'.
* etc/NEWS: Document new function 'ring-resize'.
* test/lisp/emacs-lisp/ring-tests.el (ring-test-ring-resize): New tests.

1 files changed, 4 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 7f3e74457da..668b59a20a4 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1218,6 +1218,10 @@ to mean that it is not known whether DST is in effect.
 'json-insert', 'json-parse-string', and 'json-parse-buffer'.  These
 are implemented in C using the Jansson library.
 
++++
+** New function 'ring-resize'.
+'ring-resize' can be used to grow or shrink a ring.
+
 ** Mailcap
 
 ---