[Dev] Sharing currently broken for collections that have a color assigned

[Morgen Sagen]

The sharing framework doesn't yet handle sharing of items whose kinds 
are mix-ins, and now that any item collection that is assigned a 
calendar color becomes an instance of a mix-in kind, you can't 
currently share them (well you can share them but you can't subscribe 
to them).  I'm working on a solution.  For now you can only share a 
collection that you haven't viewed in week view (that's when a color 
gets assigned).  I've already filed bug 2888 against myself to track 
this:

https://bugzilla.osafoundation.org/show_bug.cgi?id=2888

~morgen

P.S.  The reason this breaks is because the Kind of a 
Calendar-Collection-with-Color becomes something like:  
//Schema/Core/Mixins/mixin_708eb5fc, which doesn't mean anything on the 
sharees' end.  For items of a mix-in kind, I'll need to include all the 
individual mixed-in kinds' info in the XML.