* lisp/help.el (view-lossage): Use the same format as in edit-last-kbd-macro.

Call comment-indent with let-bound comment-start and comment-column.
(Bug#30560)

etc/NEWS

@@ -160,6 +160,14 @@ bound to 'C-c C-f'.
 'dired-do-copy' and 'dired-rename-file' should create non-existent
 directories in the destination.
 
+** Help
+
+*** 'C-h l' (view-lossage) now displays last keystrokes and commands
+in the same format as the edit buffer of edit-last-kbd-macro.
+This makes possible to copy the lines from the buffer generated
+by 'view-lossage', yank them to the buffer "*Edit Macro*" created by
+'edit-last-kbd-macro', and save the macro by 'C-c C-c'.
+
 ** Ibuffer
 
 ---

lisp/help.el

@@ -465,8 +465,8 @@ To record all your input, use `open-dribble-file'."
     (princ (mapconcat (lambda (key)
 			(cond
 			 ((and (consp key) (null (car key)))
-			  (format "[%s]\n" (if (symbolp (cdr key)) (cdr key)
-					   "anonymous-command")))
+			  (format ";; %s\n" (if (symbolp (cdr key)) (cdr key)
+					      "anonymous-command")))
 			 ((or (integerp key) (symbolp key) (listp key))
 			  (single-key-description key))
 			 (t
@@ -475,11 +475,11 @@ To record all your input, use `open-dribble-file'."
 		      " "))
     (with-current-buffer standard-output
       (goto-char (point-min))
-      (while (not (eobp))
-	(move-to-column 50)
-	(unless (eolp)
-	  (fill-region (line-beginning-position) (line-end-position)))
-	(forward-line 1))
+      (let ((comment-start ";; ")
+            (comment-column 24))
+        (while (not (eobp))
+          (comment-indent)
+	  (forward-line 1)))
       ;; jidanni wants to see the last keystrokes immediately.
       (set-marker help-window-point-marker (point)))))