Using this playgroud to see if one can refer to comments across bugs: see bug 147975 (comment 6) see bug 147975, comment 7 see bug 147975 comment 8 see bug 147975#c9
Reviewed my test-attachment patch
Tests work for me.
Mass move of libxpical bugs to the Internal Components, per ctalbert.
The bugspam monkeys have been set free and are feeding on Calendar :: Internal Components. Be afraid for your sanity!