RFE: make it easier to find previously-read context in "match unread" mode

Hi folks,

When reading with a threaded, "Match Only Unread Articles" view of the
headers, it is sometimes necessary but difficult to find the previously
read ancestors of an article being viewed.

If I simply un-click the View->Headers->"Match Only Unread" in order to
find an article's context, my current header selection may no longer be
highlighted in the header pane, because the article's thread is not
expanded.

At that point, pressing the up-arrow will cause the proper thread to
be highlighted, but this is very "discoverable".

Would it be possible/better to make the highlighting of an article's
thread automatic whenever the currently viewed article's header is no
longer visible due to either a view->filter change or the collapse of an
expanded thread?

Thanks,
--Jack