only auto-cachup in expanded mode

Auto-catchup marks articles, which breaks multiple selection in collapsed articles. And the auto-mark-as-read aspect makes a lot of sense in expanded mode, not so much in collapsed modes.

If this change is too aggressive, maybe you could add an option to allow auto-catchup/auto-mark-as-read in expanded mode only.

E.G. as radio buttons or dropdown in options, like so:

Automatically mark articles as read: (_) None
                                     (x) Expanded only
                                     (_) Always