Editable QComboBox contents are vertically off center on mac

The contents of a QComboBox are a pixel to high on the Mac

Repro

1. Create a QtCreator sample app and throw a QComboBox inside.
2. Set the QComboBox to be editable
3. Run the app, type in some text and select it.
4. Notice the rectangle is about a pixel too high (more on Mac High DPI)

I have attached a screenshot of an app run on a Mac with Retina display.

The work around is to add the following code to the QStyle::subControlRect

case CC_ComboBox:
{
if (const QStyleOptionComboBox* combo = qstyleoption_cast<const QStyleOptionComboBox*>(option))
{
if (subControl == SC_ComboBoxEditField)

{ result.moveTop(result.top() + 1); result.moveBottom(result.bottom() + 1); return result; }

else
return result;
}
}
break;