[Alpine-info] things that might cause Alpine to close an Inbox?

[Chime Hart via Alpine-info]

Hi Karen: I just looked but cannot find what I was going to suggest, but I seem 
to remember a setting to disable inactivity. When this used to happen if I 
followed an url which lead me to a long download, over an hour. Anyway I must 
have fixed it as I've had an inbox in a similar state for `several hours.
Chime