Iterator<? extends Map.Entry<K, ? extends VP>> previousEntries = previous.entrySet().iterator();
        Comparator<? super K> comparator = previous.comparator();

        if (currentEntries.hasNext() && previousEntries.hasNext()) {
            Map.Entry<K, ? extends VC> currentEntry = currentEntries.next();
            Map.Entry<K, ? extends VP> previousEntry = previousEntries.next();
            while (true) {

            this.currentSnapshots = currentSnapshots;
            this.previousEntries = previousSnapshots.entrySet().iterator();
            this.previousSnapshots = previousSnapshots;
            this.current = nextEntry(currentEntries);
            this.previous = nextEntry(previousEntries);
        }

        void processChange() {
            if (current == null) {

    ) {
        ListMultimap<String, FilePathWithType> results = MultimapBuilder
            .linkedHashKeys()
            .arrayListValues(1)
            .build();
        for (Entry<String, FileSystemLocationFingerprint> currentEntry : currentFingerprints.entrySet()) {
            // skip exact matches
            if (previousEntries.contains(currentEntry)) {