Deleting commerce order - tickets still valid about events

[engram-design]

In the same way that Commerce doesn't restore stock for a deleted, cancelled or refunded order, we don't either. I can see the argument that once an order is deleted, any associated tickets should be as well, but it get's tricky if that order is restored (after being soft-deleted), dealing with capacities, etc.

The other issue is that purchased tickets can be created without a related order, which is still okay to have their QR code used. There's no real way of telling if there's never been an order associated with a purchased ticket (manually created), or if there was, and the order has just been deleted. So disabling checking in if there's no order associated with the purchased ticket get's tricky without adding more more handling for flagging manually-created purchased tickets, or tracking deleted-order purchased tickets. Although if we end up trashing purchased tickets, none of that will matter.

It'd be great to have a warning when deleting the order for any checked-in tickets, but that likely won't be possible. That's also a bit of a grey area I think. Does a deleted order actually mean a refund? Does your client actually offer refunds for tickets once checked in? A few cases to consider.

I'll see what we can do.