showSecond

pub fn showSecond(self: *PanedWidget) bool {
    if (self.should_autofit) {
        if (self.init_opts.autofit_first) |autofit| {
            self.split_ratio.* = self.getFirstFittedRatio(autofit);
        }
    }

    const ret = self.split_ratio.* < 1.0;

    if (ret) {
        self.active_side = .second;
        self.layout = .{};
    } else self.active_side = .none;

    return ret;
}