Subject: Re: bug#39822: 27.0.90; Cannot set *Completions* buffer height using display-buffer-alist

From: martin rudalics <[email-masked]>
Date: Wed, 4 Mar 2020 18:30:32 +0100

> Here is a complete list of commands that use
 > with-displayed-buffer-window:
 >
 > - dired-mark-pop-up
 > - minibuffer-completion-help
 > - save-buffers-kill-emacs
 >
 > What they all have in common is that they have some post-processing
 > in the displayed buffer.  I wonder why there are no more such commands
 > that need to do such post-processing?  Maybe they use some simpler
 > solution that could be used here as well?
 >
 > For example, hack-local-variables-confirm uses just
 >
 >    (pop-to-buffer "*Local Variables*" '(display-buffer--maybe-at-bottom))

IIUC it neither runs the hooks for temporary buffers nor does it obey
'temp-buffer-resize-mode'.

 > and nothing more, without hassles of with-displayed-buffer-window.
 > And still it fits the window nicely into the buffer height.

How comes?

 > Why the above 3 commands couldn't do the same by abandoning
 > with-displayed-buffer-window?

It depends on how much of the stuff in 'temp-buffer-window-setup' and
'temp-buffer-window-show' they really need.

martin