No unread badge for days-old message in rarely used one to one room
I just entered a private channel that hasn't been used for weeks, to discover a message from yesterday that didn't trigger the unread badge/icon next to the channel name. It happened in the past with an older message - 3-4 days - also in a private channel with another Gitter user.
I'm on Linux, using Firefox 68.0.1. If you have some kind of power law for increasing polling intervals, you need a reasonable upper limit of a few minutes.
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Edited by Eric Eastwood