emacs-31 19a7d4ce7c6: Fix behavior of 'temp-buffer-resize-mode' (Bug#81207)

Martin Rudalics via Mailing list for Emacs changes <[email protected]>
Newsgroups gmane.emacs.diffs
Message-ID <[email protected]>
branch: emacs-31
commit 19a7d4ce7c6b075f2ff5d98f3e8c5c0e8e4a61cd
Author: Martin Rudalics <[email protected]>
Commit: Martin Rudalics <[email protected]>

    Fix behavior of 'temp-buffer-resize-mode' (Bug#81207)
    
    * lisp/help.el (temp-buffer-resize-mode): Fix doc-string - a
    window can be resized now even if it has shown another buffer in
    between (Bug#81207).
    (resize-temp-buffer-window): Resize window if and only if its
    buffer is the buffer it has shown initially (Bug#81207).
---
 lisp/help.el | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/lisp/help.el b/lisp/help.el
index f5fe34435bb..b5eba8707db 100644
--- a/lisp/help.el
+++ b/lisp/help.el
@@ -2003,10 +2003,8 @@ show a temporary buffer are automatically resized in height to
 fit the buffer's contents, but never more than
 `temp-buffer-max-height' nor less than `window-min-height'.
 
-A window is resized only if it has been specially created for the
-buffer.  Windows that have shown another buffer before are not
-resized.  A frame is resized only if `fit-frame-to-buffer' is
-non-nil.
+A window is resized only if it has been specially created for its
+buffer.  A frame is resized only if `fit-frame-to-buffer' is non-nil.
 
 This mode is used by `help', `apropos' and `completion' buffers,
 and some others."
@@ -2050,7 +2048,10 @@ provided `fit-frame-to-buffer' is non-nil."
 	 (quit-cadr (cadr (window-parameter window 'quit-restore))))
     ;; Resize WINDOW only if it was made by `display-buffer'.
     (when (or (and (eq quit-cadr 'window)
-		   (or (and (window-combined-p window)
+                   ;; When WINDOW was reused, its buffer must be the one
+                   ;; initially shown in it (Bug#81207).
+                   (eq buffer (nth 3 (window-parameter window 'quit-restore)))
+                   (or (and (window-combined-p window)
 			    (not (eq fit-window-to-buffer-horizontally
 				     'only))
 			    (pos-visible-in-window-p
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