bug#21140: 25.0.50; Isearch "char-fold" by default

[Artur Malabarba <bruce.connor.am@gmail.com>]

> Try it with the following example:
>
> --8<---------------cut here---------------start------------->8---
>   ;; some function
>   (turn-on-orgstruct++)
>
>   ;; other function
>   (anzu--turn-on)
> --8<---------------cut here---------------end--------------->8---
>
> As you can see on http://www.screencast.com/t/wx7r9UYK:
>
> - Completing "turn" with `C-w' will go over the 2 last "+" signs as if
>   they did not exist. In Emacs 24, each "+" char was added one by one.
>
> - Completing "anzu" with `C-w' will simplify the 2 "-" signs as being
>   just 1, making the search find no string at the end!
>
> - Completing "zu" with `C-w' will add "zu" to the pattern, multiple
>   times...

Hi Sebastien, I couldn't reproduce any of this (starting with emacs -Q).
Could you check that C-w really is bound to
`isearch-yank-word-or-char' for you (With no advices or anything)? And
then, could you try with emacs -Q?