Wrong family for QFont::Monospace on Ubuntu

Originally I reported bug 114618 in QtWebKit stating that monospace fonts were rendered as non-monospace, but it seems that the issue is deeper, so I was redirected here.

This code:

QFont font;
font.setStyleHint(QFont::Monospace);
QDebug() << font.defaultFamily();

prints “Courier New” on my Ubuntu system, but I don’t have this font installed.

When I replace QFont::Monospace with QFont::TypeWriter, it prints just “Courier”, which also doesn’t exist.

The default fontconfig monospace font on my system is “DejaVu Sans Mono”:

$ fc-match monospace
DejaVuSansMono.ttf: "DejaVu Sans Mono" "Book"

Because of this bug QtWebKit renders all font-family: monospace blocks using non-monospace font, so it is quite a critical issue.