Angle bracket-enclosed <irc://.../#room> URLs do not appear as hyper-links

[Graham Perrin]

Visit <http://n2.nabble.com/Chandler-community-bug-fests-on-IRC-td1676806.html> for an example.

Now, testing:
<feed://images.apple.com/main/rss/hotnews/hotnews.rss> 
<webcal://schooltool.freeman-centre.ac.uk/calendar.ics>
<afp://foo.bar/path>
<smb://foo.bar/path>
<callto:perrin.redirectme.net>
<irc://irc.freenode.net/#diigo>

(That list echoed from <http://groups.diigo.com/Diigo_HQ/forum/topic/some-types-of-url-prefix-not-hyper-linked-when-topics-messages-are-posted-9206>.)

[Graham Perrin]

An obvious workaround: check the box for  
[√] Message in HTML Format

However, depending on the nature of an underlying list, and depending on the author's HTML, representations of the (Nabble) original may appear strange.

An example:

<http://n2.nabble.com/Two-new-unofficial-channels---caldav-interop-and---caldav-google-td2015839.html> 
— looks good

<http://lists.osafoundation.org/pipermail/chandler-dev/2008-December/010469.html>
<http://lists.osafoundation.org/archives/chandler-dev/200812.mbox/[e-mail]%3e>
<http://thread.gmane.org/gmane.org.osaf.devel/9192>
<http://osafoundation.markmail.org/message/kjgwebdmufvdsqbf?q=list:org%2Eosafoundation%2Echandler-dev&page=1>
— all lack the clarify of the HTML Nabble original.

I guess that there is no universally pleasing solution to this. Just sharing my observation.