bug#35326: 26.1; vc-git-grep should pass -i like isearch

[Lars Ingebrigtsen]

Antoine Beaupré <anarcat@orangeseeds.org> writes:

> -(defcustom vc-git-grep-template "git --no-pager grep -n -e <R> -- <F>"
> +(defcustom vc-git-grep-template "git --no-pager grep -n <C> -e <R> -- <F>"
>    "The default command to run for \\[vc-git-grep].
>  The following place holders should be present in the string:
> + <C> - place to put the options like -i.

Thanks; applied to the trunk.

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