Lightning should provide support to marking events as they affect to the busy time by implementing schedule-calendar-transp Property which is defined in the rfc 6638. Currently lightning can filter the TRANSPARENT property but cannot mark an event as OPAQUE or TRANSPARENT.
This is not a meta bug, but bug 1000390 is. Please just link the bugs to each other in the future :)
Summary: [meta][GSoc 2014] Complete the Implementation of schedule-calendar-transp Property → Complete the Implementation of schedule-calendar-transp Property
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