rectFor

pub fn rectFor(self: *TextLayoutWidget, id: dvui.Id, min_size: Size, e: Options.Expand, g: Options.Gravity) Rect {
    _ = id;

    // For corner widgets, they might want to be closer to the border than the
    // text, so fit them without padding, but then need to adjust origin
    // because screenRectScale assumes we placed in the contentRect
    var ret = dvui.placeIn(self.data().backgroundRect().justSize(), min_size, e, g);
    ret.x -= self.data().options.paddingGet().x;
    ret.y -= self.data().options.paddingGet().y;

    const i: usize = if (g.y < 0.5) if (g.x < 0.5)
        0 // upleft
    else
        1 // upright
    else if (g.x < 0.5)
        2 // downleft
    else
        3; // downright

    self.corners[i] = ret;
    self.corners_last_seen = @intCast(i);
    return ret;
}