bug#35860: Delayed window positioning after buffer display

[Juri Linkov]

> OK.  But
>
> -;; (4) A marker (`help-window-point-marker') to move point in the help
> +;; (4) A marker (`window-point') to move point in the help
>  ;;     window to an arbitrary buffer position.
>
> sounds irritating IMHO.  If it's used for help windows only, then why
> rename it?  Otherwise, we should at least leave the '-marker' postfix
> and provide some additional identification so maybe use something like
> 'temp-buffer-window-point-marker'

It's generalized now to be used not only for help windows.
The '-marker' postfix is not needed because it can be either
marker or integer, i.e. any value that set-window-point accepts
for its POSITION argument.