If threading is turned off (T T in summary buffer) and %B is used in
g-s-line-format, an extra gnus-sum-thread-tree-single-leaf "\-> " would be
inserted.  I have attached a patch to fixed this.  It is a diff against the
latest (7/24/01 5pm) CVS.

Can someone who has write access commit the patch?

Thanks!
-- 
Danny Dick-Fung Siu        mailto:dsiu@adobe.com
Acrobat Engineering @ Adobe Systems Incorporated