[REG: 5->6.2.3] QVariant(QString()) claims that isNull() is false

On Qt v5.15.7 - Also on all previous versions from 5.5 upwards.

The following code returns true.

QVariant(QString()).isNull();   //returns true

On Qt v6.2.3

The following code returns false.

QVariant(QString()).isNull();   //returns false

The only change I can find with regard to QVariant::isNull is the following;

Adapt SQL drivers to Qt 6 change of QVariant::isNull - qt/qtbase@999d856 - GitHub