Add a new edebug-breakpoint face

* doc/lispref/edebug.texi (Breakpoints): Mention it.

* lisp/emacs-lisp/edebug.el (edebug-breakpoint): New face.

doc/lispref/edebug.texi

@@ -497,7 +497,8 @@ Edebug commands for breakpoints:
 Set a breakpoint at the stop point at or after point
 (@code{edebug-set-breakpoint}).  If you use a prefix argument, the
 breakpoint is temporary---it turns off the first time it stops the
-program.
+program.  An overlay with the @code{edebug-breakpoint} face is put at
+the breakpoint.
 
 @item u
 Unset the breakpoint (if any) at the stop point at or after

etc/NEWS

@@ -1462,6 +1462,10 @@ the Elisp manual for documentation of the new mode and its commands.
 
 ** Edebug
 
+*** New face 'edebug-breakpoint'
+When setting breakpoints in Edebug, an overlay with this face is
+placed over the point in question.
+
 +++
 *** New command 'edebug-unset-breakpoints'
 To clear all breakpoints in the current form, the 'U' command in

lisp/emacs-lisp/edebug.el

@@ -63,6 +63,9 @@
   "A source-level debugger for Emacs Lisp."
   :group 'lisp)
 
+(defface edebug-breakpoint '((t :inherit highlight))
+  "Face used to mark breakpoints."
+  :version "27.1")
 
 (defcustom edebug-setup-hook nil
   "Functions to call before edebug is used.
@@ -3226,7 +3229,7 @@ the breakpoint."
         (let* ((pos (+ start (aref offsets (car breakpoint))))
                (overlay (make-overlay pos (1+ pos))))
           (overlay-put overlay 'edebug t)
-          (overlay-put overlay 'face 'highlight))))))
+          (overlay-put overlay 'face 'edebug-breakpoint))))))
 
 (defun edebug--overlay-breakpoints-remove (start end)
   (dolist (overlay (overlays-in start end))