From 2c0d8774b423e31d20b74c243fd93983b1949946 Mon Sep 17 00:00:00 2001
From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Date: Sun, 6 Nov 2016 23:29:12 +0100
Subject: [PATCH] ox-latex: Allow horizontal rules in table math mode

* lisp/ox-latex.el (org-latex--math-table): Handle horizontal rules.
* doc/org.texi (Tables in @LaTeX{} export): Update documentation.
---
 doc/org.texi     | 9 ++++-----
 etc/ORG-NEWS     | 5 +++++
 lisp/ox-latex.el | 3 +--
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/doc/org.texi b/doc/org.texi
index ef653b5bc..65020e35a 100644
--- a/doc/org.texi
+++ b/doc/org.texi
@@ -12063,11 +12063,10 @@ layout and contents.  Valid @LaTeX{} attributes include:
 @vindex org-latex-default-table-mode
 Nature of table's contents.  It can be set to @code{table}, @code{math},
 @code{inline-math} or @code{verbatim}.  In particular, when in @code{math} or
-@code{inline-math} mode, every cell is exported as-is, horizontal rules are
-ignored and the table will be wrapped in a math environment.  Also,
-contiguous tables sharing the same math mode will be wrapped within the same
-environment.  Default mode is determined in
-@code{org-latex-default-table-mode}.
+@code{inline-math} mode, every cell is exported as-is and the table is
+wrapped within a math environment.  Also, contiguous tables sharing the same
+math mode are merged within the same environment.  Default mode is determined
+in @code{org-latex-default-table-mode}.
 @item :environment
 @vindex org-latex-default-table-environment
 Environment used for the table.  It can be set to any @LaTeX{} table
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 8b2d1f697..a360e3573 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -23,6 +23,11 @@ into
 
 : (file (lambda () (sexp)))
 
+
+** New features
+
+*** Horizontal rules are no longer ignored in LaTeX table math mode
+
 * Version 9.0
 
 ** Incompatible changes
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index bdb239bca..b9173558f 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3271,8 +3271,7 @@ This function assumes TABLE has `org' as its `:type' property and
 	 (contents
 	  (mapconcat
 	   (lambda (row)
-	     ;; Ignore horizontal rules.
-	     (when (eq (org-element-property :type row) 'standard)
+	     (if (eq (org-element-property :type row) 'rule) "\\hline"
 	       ;; Return each cell unmodified.
 	       (concat
 		(mapconcat