[PyQt] QStyle.styleHint() returning negative value for rgb

[Jugdish]

I'm trying to get the color value for the table grid by making the following
call:

QtGui.QApplication.style().styleHint(QtGui.QStyle.SH_Table_GridLineColor,
option, self)

but this returns -3684409, which is not a valid qRgb (throws an error when
constructing a QColor from it). Looking at the internals of styleHint, the
number that it's returning is actually
option.palette.color(QPalette.Mid).rgb(). If I call that method directly, I
get 4291282887. So at what point is this value becoming negative?
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