* simple.el (eval-expression-minibuffer-setup-hook): New hook.

* simple.el (eval-expression-minibuffer-setup-hook): New hook.
(eval-expression): Run it.

Extend eldoc to display info in the mode-line.
* emacs-lisp/eldoc.el (eldoc-post-insert-mode): New minor mode.
(eldoc-mode-line-string): New variable.
(eldoc-minibuffer-message): New function.
(eldoc-message-function): New variable.
(eldoc-message): Use it.
(eldoc-display-message-p)
(eldoc-display-message-no-interference-p): Support
eldoc-post-insert-mode.

Fixes: debbugs:13978