Re: Patch: prefer-window-split-horizontally

[Juri Linkov]

>     There was an idea to rewrite the whole `display-buffer' in Lisp, and make
>     it more customizable.  But it seems it is impossible to rewrite it
>     completely, because the current C implementation processes its input
>     argument `frame' which isn't given to display-buffer-function:
>
> So what?  How does that stop us from replacing the C code with Lisp code?

Actually this stop us from duplicating Fdisplay_buffer in Lisp as a
function that is called via `display-buffer-function' from the C function
Fdisplay_buffer (because we can't add a new argument `frame' which will break
existing user functions called via `display-buffer-function'), but this
doesn't stop us from replacing the whole C function `Fdisplay_buffer' with
Lisp code.

-- 
Juri Linkov
http://www.jurta.org/emacs/