Interactive Highlighting: prefix argument to select subexp

* doc/emacs/display.texi (Highlight Interactively):
* etc/NEWS: Document the change.
* lisp/hi-lock.el (hi-lock-face-buffer, hi-lock-set-pattern): Use
the prefix argument to highlight only the corresponding sub-expression
of the regexp (Bug#32365).

Copyright-paperwork-exempt: yes

1 files changed, 2 insertions, 1 deletions

diff --git a/doc/emacs/display.texi b/doc/emacs/display.texi
index 2f5ce80d607..fe4936d85a1 100644
--- a/doc/emacs/display.texi
+++ b/doc/emacs/display.texi
@@ -975,7 +975,8 @@ the word ``whim'' using the default face (a yellow background), type
 @kbd{M-s h r whim @key{RET} @key{RET}}.  Any face can be used for
 highlighting, Hi Lock provides several of its own and these are
 pre-loaded into a list of default values.  While being prompted
-for a face use @kbd{M-n} and @kbd{M-p} to cycle through them.
+for a face use @kbd{M-n} and @kbd{M-p} to cycle through them.  A prefix
+argument limits the highlighting to the corresponding subexpression.
 
 @vindex hi-lock-auto-select-face
 Setting the option @code{hi-lock-auto-select-face} to a non-@code{nil}