[MERGE] Support Claws as a mail client.

[John Arbash Meinel]

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Gavin Panella wrote:
> This branch adds support for the Claws MUA in a similar way to how
> KMail, Evolution, Mutt, Thunderbird, etc. are supported. In theory,
> the XDGEmail client should be enough, but a bug in xdg-utils prevents
> it from working correctly:
> 
>   Bug 291847 in xdg-utils "xdg-open mangles mailto: urls"
>   https://bugs.edge.launchpad.net/ubuntu/+source/xdg-utils/+bug/291847
> 
> By also using the --attach option to claws-mail, it prevents the
> display of a superfluous modal dialog in Claws that informs the user
> that a file has been attached to the email.
> 
> As suggested by Aaron Bentley, I will also package this as a plugin so
> that people using packaged versions of bzr (in Ubuntu, for example)
> can use this sooner.
> 
> Thanks!
> 

['--compose', 'mailto:?', '--attach', 'file%']

"claws --compose mailto:?"

a valid command line for claws?

The only other thing I might add to the test would be an actual
non-ascii character to the "commandline_is_8bit" test. You could use
something like u"\xb5" (aka µ). It would also be nice to test that when
the character is properly encoded, that Claws then recognizes that
subject correctly.

Anyway, this seems like a reasonable addition, I mostly want to make
sure that you tested the command lines generated really do work with Claws.

BB:tweak

John
=:->
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