undo mark all as read

### How to use GitHub

* Please use the 👍 [reaction](https://blog.github.com/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/) to show that you are interested into the same feature.
* Please don't comment if you have no relevant information to add. It's just extra noise for everyone subscribed to this issue.
* Subscribe to receive notifications on status change and new comments.

---

## Feature request

**Is your feature request related to a problem? Please describe.**

Sometimes I do not realize that I am currently not viewing a single folder but instead all items from all folders.
I have lost multiple times the unread state of all my feeds by erroneously marking all of them as read.

**Describe the solution you'd like**

It would be nice if there were an UX undoing the mark all as read action. Maybe presenting a small roast with an undo button right after all news were marked as read could be possible.
And wait for a small timeout to sync the mark all as read effects to the server.

**Additional context**
Thank you very much for creating this app <3