bug#60070: 27.2; Fully ignore whitespace option for ediff

[Eli Zaretskii]

> Cc: jurgen.de-backer.ext@eurocontrol.int, philippe.waroquiers@eurocontrol.int
> Date: Wed, 14 Dec 2022 16:19:56 +0000
> From:  Jurgen De Backer via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Because we have a few files in which ediff doesn't handle whitespace
> differences well, we have added an option to the ediff menu that allows
> to add the options -Bbw to the diff command (actually an on/off toggle0,
> so that whitespace is ignored in the diff output before the difference
> regions are calculated.
> We think that this option may be useful to include
> in the official emacs.
> Please have a look at the attached patch and let us know what you think.

Thanks.

This is a substantial contribution, for which we would need a
copyright assignment from you.  Would you like to start your legal
paperwork at this time, so that we could accept these changes when it
is done?  If so, I will send to you the form to fill and the
instructions to email it after filling.

Thank you for your interest in Emacs.