[Feature Request]: Allow for folder whitelist instead of blacklist

[TheZoker]

Feature Description

I have a lot of folders within my gmail account. Everytime I add one, I need to adjust the folder blacklist.

It would be nice, if there was the option, to set the folders that SHOULD be included instead of setting the ones to ignore. Thanks!

Proposed Solution

Add new option to select whitelist or blacklist mode for folder

[wiltet]

or what's about the idea to list all availlable folders and the possibility to tick or untick them?