Labels are lost during conversion for reference tags following a macro parameter with a reference tag in it

When a reference tag (<a>) is used in a macro parameter, setAccumulateContent(true) is called. This remains active for all the reference tags following this macro parameter and this eats labels for links specified using <a> tags appearing after this label.

For instance, for a page containing:

<a href="http://url">label1</a>
<ac:structured-macro ac:name="somemacro"><ac:parameter name="url"><a href="http://perdu.com">Perdu</a></ac:parameter></ac:structured-macro>
<a href="http://url">label2</a>

label1 will be migrated, but label2 will be lost.

This is a case where a global state exists without us noticing.