Stripe colors consistent on calandar

Hi,

I've noticed when you use repeating events, the colors of the events when displayed on the calender are not consistent. This is because the code in event.theme looks for the node 'nid' for maintaining consistent colors. However, repeating events have different nids, therefore different colors when displayed.

I had success with using the event title rather than the nid, as these remain the same in the repeating event. I've attached the updated event.theme that I'm using to do this.