Function style::properties::cascade::tweak_when_ignoring_colors

fn tweak_when_ignoring_colors(
    context: &Context<'_>,
    longhand_id: LonghandId,
    origin: Origin,
    declaration: &mut Cow<'_, PropertyDeclaration>,
    declarations_to_apply_unless_overridden: &mut SmallVec<[PropertyDeclaration; 2]>
)