When a filter is set to highlight certain emails (from a particular "FROM" address, for instance), the emails listed in the message list show proper highlighting while scrolling down the list, but when you scroll backwards the highlight is no longer shown.

Reproducible: Always

Steps to Reproduce:
1.Set a filter to highlight messages as "Important", make sure it catches many over several pages of message list.
2. Review messages in message list, page down, see that highlight appears.
3. Page back up.  See that highlight of "Important" messages does not appear on newly displayed list of messages in the window.
Actual Results:  
As expected, messages do not show highlighting as "Important" (green).  Even worse, if you cursor over the messages or click in the window, the highlighting disappears.  The whole thing seems to be broken.

Expected Results:  
Messages should still be highlighted in green as "Important".  This highlighting should survive scrolling, moving mouse cursor, etc., but it does not appear to do so.   

N/A