O2: Trac links don't play nicely with to-do list items

[SergeyBiryukov]

Background: #2525

1. Paste this into a new post (it's supposed to be a completed to-do item, as seen live in ​this post):

   x <a href="https://meta.trac.wordpress.org/ticket/1967">Moderators cannot see IPs and emails on profiles or in posts</a> (fixed in r4122-meta and r4123-meta)
   

2. The resulting markup is broken, see the screenshot:

   &lt;li class='o2-task-item o2-task-sortable o2-task-completed' data-item-hash='29a437b70300b32eacb10e487a51d787' data-hash-instance='0' data-item-text='&lt;a href="https://meta.trac.wordpress.org/ticket/1967"&gt;Moderators cannot see IPs and emails on profiles or in posts&lt;/a&gt; (fixed in <a href="https://meta.trac.wordpress.org/changeset/4122">r4122-meta</a> and <a href="https://meta.trac.wordpress.org/changeset/4123">r4123-meta</a>)' &gt;<input type="checkbox" name="" value="" checked><span class="o2-task-item-text"><a href="https://meta.trac.wordpress.org/ticket/1967">Moderators cannot see IPs and emails on profiles or in posts</a> (fixed in <a href="https://meta.trac.wordpress.org/changeset/4122">r4122-meta</a> and <a href="https://meta.trac.wordpress.org/changeset/4123">r4123-meta</a>)</span>
   

It works as expected if I remove r4122-meta and r4123-meta, so apparently it has to do with the links implemented in #1167. The changes in that ticket not open-sourced though, and I could not reproduce the issue on a local install with O2, so it appears to be dotorg-specific.

[ocean90]

Fixed in [dotorg12927] (same fix as in [4249]).