is this bug?

[yamagata@xxxxxxxxxxx]

Hello, I'm running zsh-2.6-beta9 on DEC alpha station with OSF/1 V3.0.
I found that ZLE history data may be wrong in case of using '<<'.
Probably this is not only in zsh-2.6-beta9.

here example,

axps:zsh-2.6-beta9$ cat << EOF
> aaa
> bbb
> cc
> EOF (press [enter])
aaa
bbb
cc

( and press ^P, I've got )
axps:zsh-2.6-beta9$ cat << EOF (<--- cursor here)

I've tested some other command instead of cat,
then it looks like that,

some << EOF
....           <--+
....              |
....              | these part will be missed
....              |
EOF            <--+

Is this correct or bug?

Best regard,
yamagata@xxxxxxxxxxx