[dev]Patch for IE mailto: links.

[Michael Cochrane]

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Okay so i couldn't think of a descriptive subject that made sence...

Basically, with IMP.reg imported and IMP set as the default mail client in
windows. When a mailto link is clicked the url that is loaded is:
http://webmail.example.com/horde/imp?action=compose&to=%1
but %1 contains a full mailto: url, not just an addresses... so the 'to' value
is along the lines of:
mailto:mike@graftonhall.co.nz?subject=Im%20broken

So i modified IMP::getComposeArgs() to decode mailto: urls on the way through.
then found a new problem with Horde::addParameter that if the parameter allready
starts with a '?' it ends up with two '?''s at the start of the query section of
the url:
http://head.graftonhall.co.nz/horde/imp/compose.php??subject=Im+broken;to=mike%40graftonhall.co.nz

when php decodes this you end up with '?subject' as the key in the
$HTTP_GET_VARS array and so the field is never added into the compose window. 

So no addParameter checks the first character of the parameter to make sure it's
not a '?' and if it is, it removes it.

So after all that: here's the patch to get it all working nicely again..

- Mike :-)

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This mail sent from Mike's CVS HEAD install of IMP: http://horde.org/imp/
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