SRU exception for w3m in order to fix launchpad login (LP: #683337)

[Tuomas Heino]

I would like to propose addition of one small feature to w3m as SRU in 
order to fix logging in to launchpad. Support for <button>-tag as defined 
by HTML 4.01 is required to login to launchpad.

While adding w3m 0.5.2-10 from Natty to -backports would certainly be 
possible, from the perspective of normal users, that would still fail to 
achieve the goal of ubuntu-bug "just working" in default server 
installation once normal upgrades have been installed.

Therefore I propose cherrypicking a backport of 020_button.patch from 
Natty to Lucid and Maverick as SRU. Related branches are ready for review 
at https://bugs.launchpad.net/ubuntu/+source/w3m/+bug/683337


Description of LP: #523229 (The Continue button isn't selectable in w3m 
for sso login) summarizes the issue well:

<quote>
Server editions recommend using w3m as a browser.

I tested login.c.c and it failed due to the fact that the continue button 
isn't selectable. This means you can add your username and password but 
not carry on past that screen.

Everything else about the form seems to be fine other than that.
</quote>


Related discussion can be found at
http://irclogs.ubuntu.com/2011/01/23/%23ubuntu-motu.html#t17:56
and LP: #523229 as well as LP: #683337 (LP: #628755 was closed when 
020_button.patch was applied to Natty).