Bug: CONDSTORE missing MODIFIED response for unchanged items

[titanism]

See RFC 4551 section here:

https://datatracker.ietf.org/doc/html/rfc4551#section-3.2:~:text=When%20the%20server%20finished%20performing%20the%20operation,all%0A%20%20%20%20%20%20messages%20that%20failed%20the%20UNCHANGESINCE%20test.

When the server finished performing the operation on all the
messages in the message set, it checks for a non-empty list of
messages that failed the UNCHANGESINCE test. If this list is
non-empty, the server MUST return in the tagged response a
MODIFIED response code. The MODIFIED response code includes the
message set (for STORE) or set of UIDs (for UID STORE) of all
messages that failed the UNCHANGESINCE test.

The code below does not support this as far as I can tell:

wildduck/lib/handlers/on-store.js

Lines 310 to 383 in 7daa0e3

	if (updated) {
	getModseq((err, modseq) => {
	if (err) {
	return cursor.close(() => done(err));
	}
	if (!update.silent || condstoreEnabled) {
	// print updated state of the message
	session.writeStream.write(
	session.formatResponse('FETCH', message.uid, {
	uid: update.isUid ? message.uid : false,
	flags: message.flags,
	modseq: condstoreEnabled ? modseq : false
	})
	);
	}
	if (!flagsupdate.$set) {
	flagsupdate.$set = {};
	}
	flagsupdate.$set.modseq = modseq;
	updateEntries.push({
	updateOne: {
	filter: {
	_id: message._id,
	// include shard key data as well
	mailbox: mailboxData._id,
	uid: message.uid,
	modseq: {
	$lt: modseq
	}
	},
	update: flagsupdate
	}
	});
	notifyEntries.push({
	command: 'FETCH',
	ignore: session.id,
	uid: message.uid,
	flags: message.flags,
	message: message._id,
	modseq,
	unseenChange
	});
	if (updateEntries.length >= consts.BULK_BATCH_SIZE) {
	return db.database.collection('messages').bulkWrite(
	updateEntries,
	{
	ordered: false,
	writeConcern: 1
	},
	err => {
	updateEntries = [];
	if (err) {
	return cursor.close(() => done(err));
	}
	server.notifier.addEntries(mailboxData, notifyEntries, () => {
	notifyEntries = [];
	server.notifier.fire(session.user.id);
	return setImmediate(processNext);
	});
	}
	);
	} else {
	return setImmediate(processNext);
	}
	});
	} else {
	return setImmediate(processNext);
	}