The rationale here is that inventories don't actually pick items up - their holders do.
It's especially misleading to say that an inventory is picking up an item in creative mode when the picked-up item can't actually be added to the target inventory in the first place.
This change allows a range of new functionality, such as:
- Allowing survival players to pick items up even when their inventories are full, similarly to creative players
- Changing the destination inventory of collected items (e.g. items could be redirected to the offhand or ender chest inventory, while still allowing other plugins to understand what's happening)
As an added bonus, this obsoletes one more use case for Inventory->getHolder(), bringing us one step closer to removing the cyclic reference nightmare from inventories.
The choice of naming (EntityItemPickup, instead of EntityPickupItem) is to be consistent with other events, where the word order is SubjectObjectActionEvent.
The motivation for this is to prevent passing a dynamic argument to cancellation, which in almost all cases is a bug in user code. This same mistake also appears in a few places in the PM core (as seen in this commit), but in those cases the mistakes were mostly harmless since they were taking place before the event was actually called.
closes#3836
