A QFont's hinting preference is not preserved when calling QTextCharFormat::setFont

In my application, I noticed that DirectWrite was not always being used in my QTextDocument despite the fact that I was setting the hinting preference of my QFont to QFont::PreferNoHinting. After some investigation it turned out that the hinting preference is not preserved if you set the font in a document by calling QTextCharFormat::setFont and then applying this format to the document.

The missing code seems to be in QTextCharFormat::setFont, which needs to call setFontHintingPreference with the value from the font passed in.