Add some comments about StringPool sort order.

}

int StringPool::entry::compare(const entry& o) const {

    // Strings with styles go first, to reduce the size of the

    // styles array.

    // Strings with styles go first, to reduce the size of the styles array.

    // We don't care about the relative order of these strings.

    if (hasStyles) {

        return o.hasStyles ? 0 : -1;

    }

    if (o.hasStyles) {

        return 1;

    }

    // Sort unstyled strings by type, then by logical configuration.

    int comp = configTypeName.compare(o.configTypeName);

    if (comp != 0) {

        return comp;