Add crm indicator and hide commands in M-x

.emacs.d/lisp/init-minibuffer.el

@@ -12,7 +12,23 @@
         '(read-only t cursor-intangible t face minibuffer-prompt))
   (add-hook 'minibuffer-setup-hook #'cursor-intangible-mode)
   (setq enable-recursive-minibuffers t)
-  (minibuffer-depth-indicate-mode t))
+  (minibuffer-depth-indicate-mode t)
+
+  ;; Add prompt indicator to `completing-read-multiple'.
+  ;; We display [CRM<separator>], e.g., [CRM,] if the separator is a comma.
+  (defun crm-indicator (args)
+    (cons (format "[CRM%s] %s"
+                  (replace-regexp-in-string
+                   "\\`\\[.*?]\\*\\|\\[.*?]\\*\\'" ""
+                   crm-separator)
+                  (car args))
+          (cdr args)))
+  (advice-add #'completing-read-multiple :filter-args #'crm-indicator)
+
+  ;; Emacs 28: Hide commands in M-x which do not work in the current mode.
+  ;; Vertico commands are hidden in normal buffers.
+  (setq read-extended-command-predicate
+        #'command-completion-default-include-p))
 
 (use-package vertico
   :init