Hi,
This bug is only in the old font backend, but you said that the new font backend is slower on Windows. I have noticed that. Lines of the buffer will blink when I enable the new font backend. Is there any plan to speed up it on Windows?
Thanks.

On Feb 15, 2008 5:12 PM, Jason Rumney <jasonr@gnu.org> wrote:
Óá½à wrote:
> testcase:
> ()
> ^
> point
> Your point is on the open paren. Emacs highlights the open and close
> parens. If you try to input letters now, some letters will begin with
> a abnormal vertical line, especial for letters 'f' and 'm'. The lines
> have the save color as the background of the highlighted paren.
>
>
>
> In GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600)
>
> configured using `configure --with-gcc (3.4)'
>

Please try with `configure --with-gcc --enable-font-backend'

If the bug is only in the old font backend, and only in Emacs 23.0.60,
then it won't be worth fixing.