Keep the first-class rail order from the previous spec when chrome
re-resolves (slot mount, grid load, contribution key appearing).
Clicking a rail item must not reshuffle the list.
New related groups append. New lead contributions (Overview) insert
into the lead band before Details. More stays last.
User drag still wins via OrderChromeGroups.
Keep the first-class rail order from the previous spec when chrome re-resolves (slot mount, grid load, contribution key appearing). Clicking a rail item must not reshuffle the list. New related groups append. New lead contributions (Overview) insert into the lead band before Details. More stays last. User drag still wins via OrderChromeGroups.