Function rebase 

pub fn rebase(
    shown: &SettingValue,
    value: &SettingValue,
    current: &SettingValue,
) -> SettingValue

The window’s change of a list, from what it showed (shown) to what it sends (value), set over the list as it is now (current): what it took out taken out, what it added added, the rest as current holds it; the window’s order for what it holds. Nothing changed meanwhile: value itself. A value that is no list: value.