WhatsApp is currently testing new features through its Google Play beta program. As the well-informed WABetainfo page reports, version 2.19.101 includes a feature to ignore archived chats.
Archived chats remain archived
WhatsApp chats are archived for many reasons. Many people do not want to see chats in their WhatsApp list, or delete them altogether. Until now, the problem arose that a new message in an archived chat tears it back from archiving and pushes it back into the active chats. In addition, you are currently receiving push messages from archived chats.
This is how the settings menu with the new feature in the beta version looks like
With the update currently being tested, this should soon be over. Screenshots of WABetainfo show the new feature on Android. In the settings, there is then the option to “Ignore archived chats” under the item “Archived chats”. When the feature will be available to all users is not known yet. Also for the implementation in iOS nothing is known.