Case-Sensitive QStringRef::compare() compares the first character after the end of the StringRef

If you do a case-sensitive comparison of a QStringRef and a QLatin1String, the comparison returns a value other than 0, even if the strings are equal.
A comparison of QStrings works fine, because the character after the last character is '\0'

QString string = QLatin1String("ThisIsATestString");
QStringRef ref( &string, 0, 11 );

// returns 83 ('S')
ref.compare( QLatin1String("ThisIsATest") );

// returns 0
ref.compare( QLatin1String("ThisIsATestS") );

The problem lies within QString::compare_helper(const QChar *data1, int length1, QLatin1String s2, Qt::CaseSensitivity cs)
It would probably work, if the number of compared characters was reduced by 1 (const ushort *e = uc + length1 - 1, unless the comparison of the zero-character is mandatory for some cases.