Comment 55 for bug 115153

(In reply to comment #34)
[...]
You asked...
> So why is this? In what cases are sorting by the topmost thread message
> better than the bottommost?

And you answered...
> sorting by Size, or Subject

> If you choose to sort by Size, does Thunderbird maintain a threaded
> view?

Yes.

> Presuming it does, what Size should it sort by?

Given that it's not obvious what entry's size you really want to sort by, I'd say sticking with the topmost thread entry's size is as sensible as anything else.

> I would argue that
> Apple's "size of the thread in total" makes sense, but that might require a
> fair amount of additional code.

Correct.