When running the search on all projects, every result which is generated by the plugin looks similar to this:
project1:<span class="closed">#17</span>: task: Some Task (closed: fixed)
The html <span> tags are still visible because they are escaped by Genshi to (from the html-sourcecode):
<dt><a href="/trac/project1/ticket/17" class="searchable">project1: <span class="closed">#17</span>: task: Some Task (closed: fixed)</a></dt>
This display can be fixed by removing the literal string conversion from the searchall.py file and istead using the a "tag" object as return value.
Find attached a diff to show the required modifications.