[Dovecot] Manual thread breaking from Thunderbird

[rosenfield.albert at gmail.com]

> Mail.app and Evolution at least.
> And doesn't Outlook also support them nowadays?

Ah, you mean "saved search" containers in the tree view?
Thunderbird has these too.  Doesn't quite make it Gmail though.

I mean, it's a cute feature, but it does not modify the work flow
drastically enough to be even remotely useful as anything else than a
curiosity.  Gmail modifies, or rather, fixes the entire work flow ;-).