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<a href="https://github.com/wikimedia/parsoid/commit/b5970c4d7">Restrict nested refs not coming from templates

This better matches the behaviour of the php extension.  An instructive
example is,

&lt;ref&gt;123 {{#tag:ref|321}}&lt;/ref&gt;

{{#tag:ref|456 &lt;ref&gt;654&lt;/ref&gt;}}

The php implementation only parses the ref contents when producing the
output for reference tags, at which point, nested refs will be ignored,
as in the former case.  The &quot;321&quot; is dropped.

The latter is special, since the extension tag takes precedence over the
parser function, the inner ref will already have been processed when the
outer is added to the stack, and hence the nesting is permitted.  This
is why the inner ref precedes the outer in the references list (has a
lower number).  Unfortunately, Parsoid doesn&#39;t yet get that ordering
right.

Change-Id: I</a><a class="double-link" href="https://github.com/wikimedia/parsoid/commit/eb0e418cc">eb0e418cc</a>

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