bug#23897: 25.1.50; Argument at point not being highlighted in eldoc hints

[Eli Zaretskii]

> 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.