Change event source id will create a new event source

[ryomahan]

trafficstars

Change event source id will create a new event source not update it.

[atompie]

@ryomahan I know this one - but do not know if this is a bug. When the event source is changed and its id is missing it stops working immediately . This can be a huge problem when you have implemented this event source on page. That is why we create new event source and the old one can be deleted when it is no longer used.