1. Enable the experimental sidebar and disable the unread filter if necessary
2. Have enough channels in the channel sidebar that it fills the height of the sidebar
3. Have a user DM you
4. Scroll the sidebar so that the unread DM is off the bottom of the screen and the More Unreads indicator appears at the bottom of the sidebar
5. Click on the unread filter to turn it on
Observed: The More Unreads indicator at the bottom of the list doesn't disappear. Clicking on it does nothing.
Expected: The More Unreads indicator disappears after the filter has been enabled.