Fix current-bidi-paragraph-direction and its doc.

 src/xdisp.c (Fcurrent_bidi_paragraph_direction): For unibyte
 buffers, return left-to-right.
 doc/lispref/display.texi (Bidirectional Display): Document return value in
 buffers that are not bidi-reordered for display, and in unibyte
 buffers.

2 files changed, 9 insertions, 1 deletions

diff --git a/doc/lispref/ChangeLog b/doc/lispref/ChangeLog
index 43add469ec0..4bf615328b1 100644
--- a/doc/lispref/ChangeLog
+++ b/doc/lispref/ChangeLog
@@ -1,3 +1,9 @@
+2011-08-24  Eli Zaretskii  <eliz@gnu.org>
+
+        * display.texi (Bidirectional Display): Document return value in
+        buffers that are not bidi-reordered for display, and in unibyte
+        buffers.
+
 2011-08-23  Eli Zaretskii  <eliz@gnu.org>
 
         * nonascii.texi (Character Properties): Document the values for
diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index 8f7f4003411..0593eba8f05 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -6104,7 +6104,9 @@ omitted or @code{nil}, it defaults to the current buffer.  If the
 buffer-local value of the variable @code{bidi-paragraph-direction} is
 non-@code{nil}, the returned value will be identical to that value;
 otherwise, the returned value reflects the paragraph direction
-determined dynamically by Emacs.
+determined dynamically by Emacs.  For buffers whose value of
+@code{bidi-display-reordering} is @code{nil} as well as unibyte
+buffers, this function always returns @code{left-to-right}.
 @end defun
 
 @cindex layout on display, and bidirectional text