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Fix description of some window hooks

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* doc/lispref/windows.texi (Window Hooks): Remove text that
warns against using 'save-window-excursion' while running
'window-size-change-functions', it's no more relevant.
Clarify description of 'window-configuration-change-hook'.
This commit is contained in:
Martin Rudalics 2018-11-18 09:24:10 +01:00
parent 88762b4063
commit 7252507699
2 changed files with 21 additions and 18 deletions
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32
doc/lispref/windows.texi
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@ -6016,26 +6016,24 @@ whether a specific window has changed size, compare the return values of
@code{window-pixel-height} for that window (@pxref{Window Sizes}).
These function are usually only called when at least one window was
added or has changed size since the last time this hook was run for the
associated frame. In some rare cases this hook also runs when a window
that was added intermittently has been deleted afterwards. In these
cases none of the windows on the frame will appear to have changed its
size.
You may use @code{save-selected-window} in these functions
(@pxref{Selecting Windows}). However, do not use
@code{save-window-excursion} (@pxref{Window Configurations}); exiting
that macro counts as a size change, which would cause these functions to
be called again.
added or has changed size since the last time this hook was run for
the associated frame. In some rare cases this hook also runs when a
window that was added intermittently has been deleted afterwards. In
these cases none of the windows on the frame will appear to have
changed its size.
@end defvar
@defvar window-configuration-change-hook
A normal hook that is run every time the window configuration of a frame
changes. Window configuration changes include splitting and deleting
windows, and the display of a different buffer in a window. Resizing the
frame or individual windows do not count as configuration changes. Use
@code{window-size-change-functions}, see above, when you want to track
size changes that are not caused by the deletion or creation of windows.
A normal hook that is run every time the window configuration of a
frame changes. Window configuration changes include splitting and
deleting windows, and the display of a different buffer in a window.
The hook can be also used for tracking changes of window sizes. It
is, however, not run when the size of a frame changes or automatic
resizing of a minibuffer window (@pxref{Minibuffer Windows}) changes
the size of another window. As a rule, adding a function to
@code{window-size-change-functions}, see above, is the recommended way
for reliably tracking size changes of any window.
The buffer-local value of this hook is run once for each window on the
affected frame, with the relevant window selected and its buffer

7
lisp/window.el
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@ -9287,10 +9287,15 @@ displaying that processes's buffer."
(when size
(set-process-window-size process (cdr size) (car size))))))))))
;; Remove the following call in Emacs 27, running
;; 'window-size-change-functions' should suffice.
(add-hook 'window-configuration-change-hook 'window--adjust-process-windows)
;; Catch any size changes not handled by
;; 'window-configuration-change-hook' (Bug#32720, "another issue" in
;; Bug#33230).
(add-hook 'window-size-change-functions (lambda (_frame)
(window--adjust-process-windows)))
;; Some of these are in tutorial--default-keys, so update that if you
;; change these.