cubicweb #1806898 ical view: UID is not unique across generations of the view [open]

the UID attributes in an ical view must be unique across generations of the view, otherwise calendar app can't notice that the elements are the same, and this corrupts the calendar's db across synchronizations.

prioritynormal
typebug
done in<not specified>
load0.100
load left0.100
closed by<not specified>