#643 UID conflicts in different ics files

[Jim Hu]

This came up on the forum: http://phpicalendar.org/forums/viewtopic.php?f=50&t=3371&p=12648#p12648

What is the correct behavior when the same UID occurs in different ics files, without SEQUENCE? Should UID only be unique local to a particular calendar file, or global to all displayed calendars. If global, it leads to inconsistencies when displaying only one calendar or more than one, and which events get shown depends on the order they're parsed in.

I also wonder how UIDs work with CalDAV.