Feature request: make a difference between unseen and unread emails.

I'd like a feature to change the number displayed on the folders and other widgets to be the number on UNSEEN emails and not UNREAD emails.

Maybe something similar to this request:
https://github.com/k9mail/k-9/issues/680

Making a difference between unseen and unread is very important. That's how the WP7 mailbox works, that's how thunderbird* works, that's how I'm used to things and that's the more logical way to do things when you get a lot of email and that you don't read all of them.

I have a widget on my homepage that tells me that I have 300 unread emails. I don't care about that. Those emails are super old, I've already saw them, but I decided NOT to read them, but of course they still count as unread emails. What I care about is that yesterday I used to have 299 unread emails so it means that I have an unseen email to check.

It means that, right now, I have to do all the work. I have to remember the number of unread email I used to have in order to know if I have new emails. And there is no way to know how many UNSEEN emails I have.

Some application (like the WP7 default email app) chose to count only unseen emails. You can keep a "unread" behavior by default if you want, but at least make an opt-in option to switch between a "unread" or a "unseen" behavior. A lot of people are used to an unseen behavior and when you get a lot of emails that you don't read it gets very quickly annoying.

*: https://i.imgur.com/fVav7Qr.png

Start by reviewing the related issue 680 and locating how folder and widget counts currently use unread emails. Define the opt-in behavior for counting unseen versus unread messages, then verify that the selected mode changes the displayed counts without removing the existing unread option.