QFont::resolve_mask doesn't get set properly on font returned by QFont::resolve()

QFont QFont::resolve(const QFont &other) const

The above method neglects to set the returned font's resolve_mask to QFont::AllPropertiesResolved despite having resolved the font.

We found this while trying to work around an issue with font propagation down a widget hierarchy when one of the widgets in the middle of the hierarchy was set to use a stylesheet (and thus interrupted normal font propagation). We wrote a FontPropagator object event filter which maintains the propagation by trying to take the parent widget's font() and setting it to the child widget via QWidget::setFont. We discovered the parent font (which itself got set via normal propagation from its parent) had resolved_mask set to "0" due to this defect, which in turn cause an incorrect "resolve" attempt (and thus resolving to QApplication::font(), which is wrong) when calling QWidget::setFont() on the child.

Suggested fix is to always set "font.resolve_mask = QFont::AllPropertiesResolved;" following the call to "font.d->resolve(resolve_mask, other.d.data());". This resolved the issue on our end.