[Bug 29455] [xslt30ts] on-empty-113a

https://www.w3.org/Bugs/Public/show_bug.cgi?id=29455

--- Comment #4 from Michael Kay <mike@saxonica.com> ---
Studying the effect on this example:

        <xsl:for-each select="1 to 100">
            <xsl:sequence select="''" />
            <xsl:on-empty select="'|'" />
        </xsl:for-each>

we realised that if the conditions are right for on-empty to fire (which, under
the new rules, is the case here), then the content produced by on-empty must be
output *instead of* the result of the SC, not *in addition to* that result. So
some buffering is necessary, but only of tiny amounts of data.

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