RSS feeds and newsgroups can't be sorted before mailboxes #215
Description
I'd prefer to have my RSS feeds and newsgroups sort at the top of the folder pane, rather than the bottom, because I have so many mailboxes that they are never visible when sorted at the bottom, as they are by default, and then I forget about them and miss stuff (I've collapsed them all to take the below screenshots).
The plugin can successfully reorder mailboxes amongst each other, but I can't move any of the non-mailboxes from their default positions, as shown below.
Even though the plugin shows them sorted at the top, after a restart, RSS feeds are still at the bottom:
For that matter, choosing newsgroups to be the default to sort them first doesn't work either:
Plugin version: 1.1.1
MailNews version 52.9.8629a
Also tried with Epyrus 2.0.2 (also descended from Thunderbird 52), same there.