QVariant doesn't compare QStringList properly

When there are two QVariants with QStringList inside, comparison operators doesn't work as expected.

A simple example:

QStringList l1, l2;

l1 << "";
l2 << "33" << "434";

QVariant v1(l1), v2(l2);

const bool vl = v1 < v2;
const bool vg = v1 > v2;
const bool veq = v1 == v2;

Whatever is placed to l1 and l2, result always says v1 > v2 (vg is true, others are false).

5.6.2
("") ("33", "434") >
("33", "434") ("") >
("33", "434") ("33", "434") ==

See "Core: QDebug and comparison operator support metatypes." 49d984b48c815ac27300ad49c1125501e3e6623c https://codereview.qt-project.org/#/c/51590/