Feature Request: Mail Folder Widget

It would be terrific if K9-Mail would incorporate an folder view widget, similar to the one the GMail (and other e-mail apps) have. I came across MailListWidget for K9 (http://maillistwidgetk9.lombardi.mobi/ since the Google Play page no longer seems to work) but it no longer seems to work. Email Widget (https://play.google.com/store/apps/details?id=de.foobarsoft.emailwidget) is also supposed to work, but is apparently limited to the Unified Mailbox and doesn't provide important information like whether the message is read or unread.

Here's an example from GMail (the widget is in the middle of the screenshot on the right side):

Thank you for a terrific app, and your consideration.

Start by reviewing the current Android widget support and account or folder data entry points, then compare the requested behavior with the linked Gmail example. Define the widget's folder scope and read/unread display before implementation; done means a working folder-view widget with the agreed message-state information.