[Html-widget] HTML::Element escaping issues

[Carl Franks]

I've emailed Pete Krawczyk, a new maintainer for HTML::Tree, and he's
accepted a patch to make HTML/Element.pm's _xml_escape() routine less
greedy.
It should be included in the next release of HTML::Tree.
If you want to test anything in advance, the patch was as follows:

1724c1724
<     $x =~ s<([^\x20\x21\x23\x27-\x3b\x3d\x3F-\x5B\x5D-\x7E])>
---
>     $x =~ s<([&"'<>])>