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display-buffer and temp-buffer-resize-mode
From: |
martin rudalics |
Subject: |
display-buffer and temp-buffer-resize-mode |
Date: |
Wed, 16 Feb 2022 18:52:44 +0100 |
With the customization
(customize-set-variable
'display-buffer-alist
'(("*shell*" display-buffer-in-direction (direction . bottom))))
M-x shell will display a three lines high *shell* window on the bottom
of the frame and not - as probably expected - a window that occupies
about half of the root's height.
The reason is that 'display-buffer-in-direction' unconditionally asks
for resizing the new window via
(setq alist
(append alist
`(,(if temp-buffer-resize-mode
'(window-height . resize-temp-buffer-window)
'(window-height . fit-window-to-buffer))
,(when temp-buffer-resize-mode
'(preserve-size . (nil . t))))))
A user can fix that via
(customize-set-variable
'display-buffer-alist
'(("*shell*" display-buffer-in-direction (window-height . nil) (direction .
bottom))))
but that's undocumented and maybe not what we should ask users to do.
Note that 'display-buffer--maybe-at-bottom' has the same problem - but
that's an internal function.
There are numerous ways to fix that, all requiring some sort of surgery:
- We could simply document the current behavior. This means that for
using 'display-buffer-in-direction' as helper function for say
'display-buffer-at-bottom' we would have to append an extra
(window-height . nil) alist entry in order to suppress the resizing
('display-buffer-at-bottom' currently does not suffer from that
syndrome).
- We could inhibit the resizing. This would require a slight amendment
in the call in 're-builder' - all other calls in our code base provide
an extra 'window-height' alist entry. Nevertheless, it would be an
incompatible change of, admittedly undocumented, behavior. (Note that
for 'display-buffer--maybe-at-bottom' we would then have to fix
'hack-local-variables-confirm'.)
- We could try to refine the snippet above in some way. For example,
ask for 'resize-temp-buffer-window' only if the buffer to be displayed
is "temporary". That's a bit tricky because 'temp-buffer-resize-mode'
is a global mode and that variable does not allow to tell whether the
buffer to display is temporary at all. In either case, the
'fit-window-to-buffer' entry would have to be dropped and we still
have an incompatible change.
Any ideas?
Thanks, martin
- display-buffer and temp-buffer-resize-mode,
martin rudalics <=