QByteArray::fromBase64 can not handle concatenated base64 string

Run these 2 lines of code:

     qInfo() << QByteArray::fromBase64("SGVsbG8=");

     qInfo() << QByteArray::fromBase64("SGVsbG8=SGVsbG8="); 

The result is:

     "Hello"

     "Hello\x12\x19[\x1B\x1B"

Which is not as expected. The second line should print "HelloHello".