QSslKey constructor confused by leading whitespace

We have code of the following form:

QSslKey key( QByteArray(keyString.toUtf8()), QSsl::Rsa, QSsl::Pem);

if (key.isNull()) return false;

if (key.algorithm() != QSsl::Rsa || key.type() != QSsl::PrivateKey) return false;

return true;

When supplied a private key string of the form 

----BEGIN RSA PRIVATE KEY---\nMIIEowIBAAKCAQEA07/x1AEc2<redacted>jyJ9Utc24jNpRWsAq\n---END RSA PRIVATE KEY----

it returns true.

When supplied the same key, but with a leading space 

 ----BEGIN RSA PRIVATE KEY---\nMIIEowIBAAKCAQEA07/x1AEc2<redacted>jyJ9Utc24jNpRWsAq\n---END RSA PRIVATE KEY----

The code still succeeds under macOS Mojave.

It fails under Windows with Qt 5.10, with the algorithm/type not being correct.

It fails under Windows with Qt 5.12, with the key being null.

This appeared due to a customer doing a copy/paste of a valid key, and ending up with an invalid key.

Workaround: our code now trims keyString before using it.

Suggested fix: the QSslKey constructor should do the trim (or moral equivalent)

Note: QSslCertificate does not suffer from this, nor does QSslKey appear to suffer with trailing whitespace instead