Fix mode-line display in Calendar mode

* lisp/help.el (substitute-command-keys): New optional argument
NO-FACE, to avoid putting the 'help-key-binding' face on the key
bindings.
* lisp/calendar/calendar.el (calendar-mode-line-entry): Call
'substitute-command-keys' with the new optional argument non-nil.
(Bug#52366)

* doc/lispref/help.texi (Keys in Documentation): Document the new
optional argument of 'substitute-command-keys'.

* etc/NEWS: Announce the addition of a new argument to
'substitute-command-keys'.

doc/lispref/help.texi

@@ -372,11 +372,15 @@ quotes.  You can customize it freely according to your personal
 preference.
 @end defopt
 
-@defun substitute-command-keys string
+@defun substitute-command-keys string &optional no-face
+@vindex help-key-binding@r{ (face)}
 This function scans @var{string} for the above special sequences and
 replaces them by what they stand for, returning the result as a string.
 This permits display of documentation that refers accurately to the
-user's own customized key bindings.
+user's own customized key bindings.  By default, the key bindings are
+given a special face @code{help-key-binding}, but if the optional
+argument @var{no-face} is non-@code{nil}, the function doesn't add
+this face to the produced string.
 
 @cindex advertised binding
 If a command has multiple bindings, this function normally uses the

etc/NEWS

@@ -635,7 +635,9 @@ This works like 'C-u M-x apropos-command' but is more discoverable.
 *** Keybindings in 'help-mode' use the new 'help-key-binding' face.
 This face is added by 'substitute-command-keys' to any "\[command]"
 substitution.  The return value of that function should consequently
-be assumed to be a propertized string.
+be assumed to be a propertized string.  To prevent the function from
+adding the 'help-key-binding' face, call 'substitute-command-keys'
+with the new optional argument NO-FACE non-nil.
 
 Note that the new face will also be used in tooltips.  When using the
 GTK toolkit, this is only true if 'x-gtk-use-system-tooltips' is t.

lisp/calendar/calendar.el

@@ -1723,7 +1723,8 @@ COMMAND is a command to run, ECHO is the help-echo text, KEY
 is COMMAND's keybinding, STRING describes the binding."
   (propertize (or key
                   (substitute-command-keys
-                   (format "\\<calendar-mode-map>\\[%s] %s" command string)))
+                   (format "\\<calendar-mode-map>\\[%s] %s" command string)
+                   'hands-off-my-face))
               'help-echo (format "mouse-1: %s" echo)
               'mouse-face 'mode-line-highlight
               'keymap (make-mode-line-mouse-map 'mouse-1 command)))

lisp/help.el

@@ -1060,11 +1060,12 @@ is currently activated with completion."
     result))
 
 
-(defun substitute-command-keys (string)
+(defun substitute-command-keys (string &optional no-face)
   "Substitute key descriptions for command names in STRING.
 Each substring of the form \\\\=[COMMAND] is replaced by either a
 keystroke sequence that invokes COMMAND, or \"M-x COMMAND\" if COMMAND
-is not on any keys.  Keybindings will use the face `help-key-binding'.
+is not on any keys.  Keybindings will use the face `help-key-binding',
+unless the optional argument NO-FACE is non-nil.
 
 Each substring of the form \\\\={MAPVAR} is replaced by a summary of
 the value of MAPVAR as a keymap.  This summary is similar to the one
@@ -1141,13 +1142,17 @@ Otherwise, return a new string."
                       (let ((op (point)))
                         (insert "M-x ")
                         (goto-char (+ end-point 3))
-                        (add-text-properties op (point)
-                                             '( face help-key-binding
-                                                font-lock-face help-key-binding))
+                        (or no-face
+                            (add-text-properties
+                             op (point)
+                             '( face help-key-binding
+                                font-lock-face help-key-binding)))
                         (delete-char 1))
                     ;; Function is on a key.
                     (delete-char (- end-point (point)))
-                    (insert (help--key-description-fontified key)))))
+                    (insert (if no-face
+                                (key-description key)
+                              (help--key-description-fontified key))))))
                ;; 1D. \{foo} is replaced with a summary of the keymap
                ;;            (symbol-value foo).
                ;;     \<foo> just sets the keymap used for \[cmd].