* lisp/repeat.el: Add option to indicate repeat-mode in mode-line (bug#47566)

* lisp/repeat.el: Add option to indicate repeat-mode in mode-line (bug#47566)

* lisp/repeat.el (repeat-echo-function): Rename from repeat-mode-echo.
Add choice repeat-echo-mode-line.
(repeat-in-progress): New variable.
(repeat-post-hook): Call repeat-echo-function with nil arg
at the end of repeating sequence.
(repeat-echo-message-string): New function with body from repeat-post-hook.
(repeat-echo-message): Rename from repeat-mode-message.
(repeat-echo-mode-line-string): New variable.
(repeat-echo-mode-line): New function.