Subject: bug#13594: 24.2.92; [PATCH] compilation-start doesn't consider nil OUTWIN

From: Leo Liu <[email-masked]>
Date: Thu, 31 Jan 2013 20:35:23 +0800

On 2013-01-31 18:43 +0800, Leo Liu wrote:
> (proposed patch attached)

All three instances of display-buffer in compile fails to account for
nil value. The following patch fix them all.

 lisp/progmodes/compile.el | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

	Modified lisp/progmodes/compile.el
diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index f383e02b..09a2d9a2 100644
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -1616,7 +1616,7 @@ (defun compilation-start (command &optional mode name-function highlight-regexp)
       (set-buffer-modified-p nil))
     ;; Pop up the compilation buffer.
     ;; http://lists.gnu.org/archive/html/emacs-devel/2007-11/msg01638.html
-    (setq outwin (display-buffer outbuf))
+    (setq outwin (display-buffer outbuf)) ; Note: OUTWIN may be nil
     (with-current-buffer outbuf
       (let ((process-environment
 	     (append
@@ -1638,7 +1638,7 @@ (defun compilation-start (command &optional mode name-function highlight-regexp)
 	     (list command mode name-function highlight-regexp))
 	(set (make-local-variable 'revert-buffer-function)
 	     'compilation-revert-buffer)
-	(set-window-start outwin (point-min))
+	(and outwin (set-window-start outwin (point-min)))
 
 	;; Position point as the user will see it.
 	(let ((desired-visible-point
@@ -1647,15 +1647,16 @@ (defun compilation-start (command &optional mode name-function highlight-regexp)
 		   (point-max)
 		 ;; Normally put it at the top.
 		 (point-min))))
-	  (if (eq outwin (selected-window))
-	      (goto-char desired-visible-point)
-	    (set-window-point outwin desired-visible-point)))
+	  (when outwin
+	    (if (eq outwin (selected-window))
+		(goto-char desired-visible-point)
+	      (set-window-point outwin desired-visible-point))))
 
 	;; The setup function is called before compilation-set-window-height
 	;; so it can set the compilation-window-height buffer locally.
 	(if compilation-process-setup-function
 	    (funcall compilation-process-setup-function))
-	(compilation-set-window-height outwin)
+	(and outwin (compilation-set-window-height outwin))
 	;; Start the compilation.
 	(if (fboundp 'start-process)
 	    (let ((proc
@@ -2490,11 +2491,12 @@ (defun compilation-goto-locus (msg mk end-mk)
 	      (display-buffer (marker-buffer msg))))
 	 (highlight-regexp (with-current-buffer (marker-buffer msg)
 			     ;; also do this while we change buffer
-			     (compilation-set-window w msg)
+			     (and w (compilation-set-window w msg))
 			     compilation-highlight-regexp)))
     ;; Ideally, the window-size should be passed to `display-buffer'
     ;; so it's only used when creating a new window.
-    (unless pre-existing (compilation-set-window-height w))
+    (when (and (not pre-existing) w)
+      (compilation-set-window-height w))
 
     (if from-compilation-buffer
         ;; If the compilation buffer window was selected,
@@ -2605,9 +2607,9 @@ (defun compilation-find-file (marker filename directory &rest formats)
     (while (null buffer)    ;Repeat until the user selects an existing file.
       ;; The file doesn't exist.  Ask the user where to find it.
       (save-excursion            ;This save-excursion is probably not right.
-        (let ((pop-up-windows t))
-          (compilation-set-window (display-buffer (marker-buffer marker))
-                                  marker)
+        (let* ((pop-up-windows t)
+	       (w (display-buffer (marker-buffer marker))))
+          (and w (compilation-set-window w marker))
           (let* ((name (read-file-name
                         (format "Find this %s in (default %s): "
                                 compilation-error filename)