Subject: 24.3.93; [PATCH] Fix fit-window-to-buffer's buffer width calculation
From: Kan-Ru Chen (陳侃如) <[email-masked]>
To: [email-masked]
Date: Thu, 18 Sep 2014 17:46:55 +0800
List-Id: <debbugs-submit.debbugs.gnu.org>

To reproduce:

emacs -Q --eval '(progn (setq fit-window-to-buffer-horizontally t)
                        (set-frame-size nil 120 20)
                        (with-current-buffer-window "*scratch*" nil nil
                          (insert (make-string 20 ?x))
                          (insert (make-string 10 ?\n))
                          (insert (make-string 90 ?x))
                          (split-window-horizontally)
                          (fit-window-to-buffer)
                          (message "window width: %d" (window-width))))'

Expected result: window width: 90
Actual result: window width: 20

Patch:

From 3bcdeb847e579981229b065b8dbd01722a94fc18 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kan-Ru=20Chen=20=28=E9=99=B3=E4=BE=83=E5=A6=82=29?=
 <[email-masked]>
Date: Thu, 18 Sep 2014 17:36:54 +0800
Subject: Fix fit-window-to-buffer's buffer width calculation

 * window.el (fit-window-to-buffer): When counting buffer width,
 count the whole visible buffer.  Correctly convert the body-height
 to pixel size for window-text-pixel-size.

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index c82b6f7..9096b92 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,8 +1,14 @@
+2014-09-18  Kan-Ru Chen  <[email-masked]>
+
+	* window.el (fit-window-to-buffer): When counting buffer width,
+	count the whole visible buffer.  Correctly convert the body-height
+	to pixel size for window-text-pixel-size.
+
 2014-09-14  Glenn Morris  <[email-masked]>
 
 	* image.el (image-multi-frame-p): Fix thinko - do not force
 	a delay if none was specified.  (Bug#18334)
 
 2014-09-12  Kan-Ru Chen  <[email-masked]>
 
 	* window.el (fit-window-to-buffer): Doc fix.
diff --git a/lisp/window.el b/lisp/window.el
index 4dc30ff..c547725 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -7296,17 +7296,17 @@ accessible position."
 		 (width (+ (car (window-text-pixel-size
 				 nil (window-start) (point-max)
 				 (frame-pixel-width)
 				 ;; Add one char-height to assure that
 				 ;; we're on the safe side.  This
 				 ;; overshoots when the first line below
 				 ;; the bottom is wider than the window.
 				 (* body-height
-				    (if pixelwise char-height 1))))
+				    (if pixelwise 1 char-height))))
 			   (window-right-divider-width))))
 	    (unless pixelwise
 	      (setq width (/ (+ width char-width -1) char-width)))
 	    (unless (= width body-width)
 	      (window-resize-no-error
 	       window
 	       (- (max min-width
 		       (min max-width
-- 
1.9.1