Originally Posted by QuadroTony
what it means for regular users?
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Probably not much. It just means for addon authors that they now can correctly identify which events have already been processed. This reduces guesswork and is great for addons like Master Merchant, Awesome Guild Store and others that scan and process events.
For example in AGS when two items with the same sell value got sold right one after another, it may happen that in the mail I show the same item twice. With this function I now can tell that I already showed one of these two events and correctly display the other instead. Combined with the newly added item names in the mails this will eliminate any uncertainty about which event a mail refers to.