Split with refund sometimes shows amount incorrectly signed

[scottohara]

Sometimes entering (when autofilled from last transaction for payee) or editing a split that has a refund, the refund amount is positive and not negative.

Requires deleting & re-adding the split item.

[scottohara]

UPDATE 3/1/18 - I've been unable to reproduce in dev.

Next time it happens in prod, need to capture exact repro steps.