bug#8531: 24.0.50; shell-quote-argument shouldn't escape special characters

[Glenn Morris]

Eli Zaretskii wrote:

> He doesn't.  But a literal Vid\éos (with the backslash typed by hand)
> doesn't work with Eshell, either.  Doesn't Eshell support the standard
> shell feature whereby a non-special character escaped by a backslash
> stands for itself?

>From reading the comments in eshell-parse-backslash, no.