I just can’t find a decent email client that looks like it’s from the last 20 years. Geary and Evolution both appear to be pretty modern but something about using Gmail with a Yubikey just doesn’t work and neither of them will connect to my account. Both on Fedora and OpenSUSE. Thunderbird works but it’s so old fashioned and Betterbird doesn’t look much better. What’s everyone else using?
Aah, now I understand.
There is no such setting that I’m immediately aware of - but I am automatically getting messages for my folders. So I’m assuming it’s doing something in the background: most likely a periodic sync for the entire account.
Definitely doesn’t sound like the behavior you wanted, my bad. But, at least there are notifications on the folders once mail is received. 😅
Edit: In the repo for their sync engine it explains:
So the foreground worker only idles on the primary folder, but it does slowly iterate over all folders in the background.
No settings have been added for this functionality (that I’m aware of).
Edit 2: Went back and read your original comment; hadn’t noticed the PR was yours. If that’s the case then you’re probably aware of how the sync works anyway. My bad if I’ve posted stuff you’re already aware of.