bug#3413: 23.0.94; ispell choices buffer display problem

[martin rudalics]

> 1. emacs -Q
> 2. Type `thre threee'
> 3. Type `C-x 2' twice.  Now the frame has three windows stacked
>    vertically, in the lowest window (window-height) returns 18, in each
>    of the two upper windows (window-height) returns 9.
> 4. Make either of the two upper windows the selected window, and in that
>    window make the text typed in step 2 an "active region" (select with
>    the mouse or type `C-a C-SPC C-e').
> 5. Type `M-$'
> => The selected window splits vertically, in the lower one of these,
>    `thre' is highlighted, the upper window contains a two-line high
>    *Choices* buffer displaying 10 corrections for `thre'.
> 6. Type `SPC'
> => In the lower window now `threee' is highlighted, the *Choices*
>    buffer in the upper window displays one empty line, and is
>    unscrollable.

This should work now with trunk/master.  Please have a look.

Thanks, martin