emacs 22.1 + Gnus v5.11: summary buffer, no color update on read.

[Michal]

Hallo Group Readers.

I changed gnus-summary-line-format from:
"%U%R%z%I%(%[%4L: %-23,23f%]%) %s\n"
to
"%I%(%[%4L: %-23,23f%]%) %s\n"

just not to have a few status characters from beginning of line.

After this change I noticed that when I am in my IMAP folder, line
header of new message does not change color after it is read. To
change its color I need to exit and reenter my imap folder. I am
guessing that the reason is that color changing is based on these
characters I just removed from display, and also on some IMAP flags,
that are read at IMAP folder visit. Am I wrong? Is there a way to make
these colors be updated properly for my configuration?

Best regards,
Michal