From 25ddcb9c35784166b6b5f5b9e72c3e8f98cbb1c2 Mon Sep 17 00:00:00 2001
From: Bastien Guerry <bzg@altern.org>
Date: Thu, 26 Jan 2012 09:24:51 +0100
Subject: [PATCH] org.el: `org-preview-latex-fragment' requires a buffer file
 name.

* org.el (org-preview-latex-fragment): Throw an error when
called from a non-file buffer.

This take care of this bug:
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3768
---
 lisp/org.el | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lisp/org.el b/lisp/org.el
index 94ff9f7f5..7a68b7363 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -16764,6 +16764,8 @@ the cursor is before the first headline,
 display all fragments in the buffer.
 The images can be removed again with \\[org-ctrl-c-ctrl-c]."
   (interactive "P")
+  (unless buffer-file-name
+    (error "Can't preview LaTeX fragment in a non-file buffer"))
   (org-remove-latex-fragment-image-overlays)
   (save-excursion
     (save-restriction
-- 
2.11.4.GIT