> You mean, that "a" on the right fringe of the rightmost window?
 > That's entirely unrelated to the problems I fixed in r117417.

Visually they are very similar.

 > A
 > recipe would help, though.

The following is 100% reproducible with emacs -Q on a Lucid build
(compare the attached screenshots):

(1) C-u C-h t hebrew RET

(2) C-x 3                              (gives hscroll-0.png)

(3) M-: (set-window-hscroll nil 1)     (gives hscroll-1.png)

(4) M-: (set-window-hscroll nil 2)     (gives hscroll-2.png)

(5) M-: (set-window-hscroll nil 1)     (gives hscroll-3.png)

Note again: NOT reproducible on my Windows build.

martin