[Tracker] deskbar handlers and a fix

["Marcus Fritzsch" <fritschy googlemail com>]

So again, fixes.

I fixed one bug[1] regarding escaping and quoting in the handlers. As
quoting and escaping is pretty central to the whole matter of opening
something - can someone test emails (and what ever you can find ;o)).

Thanks, Marcus

[1] https://bugs.launchpad.net/ubuntu/+source/tracker/+bug/130889

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