[master] questions about recent changes in xlat

[Chaigneau, Nicolas]

> > 
> > So... I'm confused right now. What am I doing wrong ?
>
>   Not much.
>
>   I've added some tests in commit 95f1d5c1.
>
>   And yes, \%{ results in \%{.



Alright, I found out why it does not work.

In function _xlat_eval:

	len = xlat_tokenize_ephemeral(ctx, &node, NULL,
				      &FR_SBUFF_IN(fmt, strlen(fmt)),
				      NULL, &(tmpl_rules_t){ .dict_def = request->dict });


_xlat_eval does not provide a "fr_sbuff_parse_rules_t" with the escape function.
As compared with the code in unit tests, which does:

			fr_sbuff_parse_rules_t	p_rules = { .escapes = &fr_value_unescape_double };

			slen = xlat_tokenize_ephemeral(xlat_ctx, &head, NULL,
						       &FR_SBUFF_IN(fmt, talloc_array_length(fmt) - 1), &p_rules, NULL);



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