Looks like the fixes will be needed in major modes?

For instance, by adding the following debug statement in elisp--highlight-function-argument function in elisp-mode.el,

=====

diff --git a/lisp/progmodes/elisp-mode.el b/lisp/progmodes/elisp-mode.el

index f360791..16365dd 100644

--- a/lisp/progmodes/elisp-mode.el

+++ b/lisp/progmodes/elisp-mode.el

@@ -1481,6 +1481,7 @@ elisp--highlight-function-argument

(setq doc (copy-sequence args))

(add-text-properties start end (list 'face argument-face) doc))

(setq doc (eldoc-docstring-format-sym-doc prefix doc))

+ (message "debug: doc = %S" doc)

doc)))

;; Return a string containing a brief (one-line) documentation string for

=====

I get the below when the cursor is after a defun:

debug: doc = #("defun: (NAME ARGLIST &optional DOCSTRING DECL &rest BODY)" 0 5 (face font-lock-keyword-face))

I get the same debug output in both emacs-25 and master builds. So I am wondering if this doc output needs to be adjusted to the change in the format function then ..

Also, I can see if debug of incorrect face display in both mode-line (when I am using the minibuffer to eval stuff using M-: binding) and echo area.

On Thu, Jul 7, 2016 at 3:45 PM Eli Zaretskii <eliz@gnu.org> wrote:

> From: Kaushal Modi <kaushal.modi@gmail.com>
> Date: Thu, 07 Jul 2016 19:31:26 +0000
> Cc: martin rudalics <rudalics@gmx.at>, Dmitry Gutov <dgutov@yandex.ru>
>
> [0644e6f56d2be82dd716478eb65e7b3c761d813d] Fix copying properties in 'format' when it produces padding
>
> Building emacs using that commit shows that bug.

Then the fix will have to be in the code which calls format, because
the above commit is going to stay.

If no one beats me to it, I will look into this in a day or two.

Thanks for the analysis.