Fix network filtering
filterRegExp must not be ported to filterRegularExpression in Qt5
setFilterFixedString sets filterRegExp, but not filterRegularExpression
In Qt6 this is fixed
CCMAIL: montel@kde.org
filterRegExp must not be ported to filterRegularExpression in Qt5
setFilterFixedString sets filterRegExp, but not filterRegularExpression
In Qt6 this is fixed
CCMAIL: montel@kde.org