Re: grep-command: Ignore case if case-fold-search is non-nil

[Paul Eggert]

Eli Zaretskii wrote:
> case-fold-search defaults to non-nil, so this would make "M-x grep"
> case-insensitive for many users.  I'm not sure they will like it.

Similarly for M-x grep-find and find's -i option, and for M-x vc-git-grep, and 
for M-x diff and diff's --ignore-case and --ignore-file-name-case options, and 
probably for other stuff.

It might be OK to add a new variable, which would have the effect of setting 
case-fold-search and all the other stuff, for users who want case-folding to be 
the default everywhere. But where would it stop? Would the new setting also have 
the effect of setting font-lock-keywords-case-fold-search, say?