verification in DM is cancelled by second syncing device when receiving .ready event

[bwindels]

No description provided.

[bwindels]

e.g. we're bob, and we're trying to verify alice:
- bob1 sends .request
- alice1 sends .ready
- bob2 send .cancel saying .ready is unexpected in phase PHASE_UNSENT

see VerificationRequest._cancelOnError:

const isUnexpectedRequest = type === REQUEST_TYPE && this.phase !== PHASE_UNSENT;
        const isUnexpectedReady = type === READY_TYPE && this.phase !== PHASE_REQUESTED;
        if (isUnexpectedRequest || isUnexpectedReady) {
            logger.warn(`Cancelling, unexpected ${type} verification ` +
                `event from ${event.getSender()}`);
            const reason = `Unexpected ${type} event in phase ${this.phase}`;
            await this.cancel(errorFromEvent(newUnexpectedMessageError({reason})));
            return true;
        }

[bwindels]

It's not sending a .cancel anymore but the UX is still off, filed #11964 for that and closing this.