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This code regressed in Qt 6:

    QVector<int> v;
    v.resize(4);
    v.erase(v.begin());
    while (v.size() < v.capacity()) {
        v.push_back(0);
    }

The while loop never terminates; the vector is reallocated too early, when size() == capacity() - 1, and keeps getting reallocated like that.

relates to

QTBUG-93019 [REG 5.15-6.0] QList/QVector regressions

For Gerrit Dashboard: QTBUG-92941
#	Subject	Branch	Project	Status	CR	V
350928,4	Introduce side-aware capacity-like methods to QList	dev	qt/qtbase	Status: DEFERRED	0	0
354792,2	QList: more explicitly document capacity() shenanigans	dev	qt/qtbase	Status: MERGED	+2	0
355265,2	QList: more explicitly document capacity() shenanigans	6.2	qt/qtbase	Status: MERGED	+2	0