Reordering should preserve previous reordering rule as a secondary rule

I reorder my incoming mails by incoming timestamp. Then, I reorder them by “From” field.

Now I can see the mails coming from “XY” after each other (up till now it is good) but their occurrence order seems to be random. I would prefer to order the mails from XY not randomly but by incoming timestamp, i. e. according to the previous ordering rule.

I think the last 3 rules should be maintained and shift them one level deeper if a new ordering rule is defined.