New function, conditionally aliased to `mode-line-window-height-fudge'. (ispell-help): Use it. (ispell-choices-win-default-height): Don't include mode-line fudge. (ispell-choices-win-default-height): New function. (ispell-show-choices, ispell-command-loop): Use function `ispell-choices-win-default-height' instead of variable.