-1 (negative one) tags

RonBurk

FYI, Zotero is capable of getting confused on tag count when you delete tags quickly. Heisenbug, can't help repro. Good place for an assertion perhaps. Screenshot:

https://drive.google.com/open?id=1qzQhWQWwjBFCLIuOFZnJF6CHXfTXu9wZ