bug#18125: file-precious-flag breaks symlinks

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> IMO, we could provide the alternative behavior as opt-in, conditioned
> on a new option.  It is not clear to me that everyone will want to
> overwrite the target, so an incompatible change here must be an
> opt-in.

It's a pretty specialised option (which makes it hard to explain), but I
get your point about being backwards-compatible in this area.

So I've now added the new option and adjusted the code.

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