[kde-linux] KDE 3.4.2: What does the white minus sign in the red circle mean?

[Randy Kramer]

(I think/hope this is the (or at least a) right mail list for kmail user 
questions.)

Every once in a while I fat finger something and end up with either a 
single message or an entire thread marked with an icon that looks like 
a white minus sign in a red circle.

I don't know:
   * what it means
   * how I got it
   * how to get rid of it

Thanks for any help!

Randy Kramer
-- 
I didn't have time to write a short letter, so I created a video 
instead.--with apologies to Cicero, et.al.