org-export: Fix previous/next element finding in secondary strings

* contrib/lisp/org-export.el (org-export-get-previous-element,
  org-export-get-next-element): Correctly retrieve previous and next
  object, if any, in secondary strings.
* testing/lisp/test-org-export.el: Add tests.

contrib/lisp/org-export.el

@@ -4463,7 +4463,19 @@ object, a string, or nil."
 	      (cond ((eq obj blob) (throw 'exit prev))
 		    ((memq obj (plist-get info :ignore-list)))
 		    (t (setq prev obj))))
-	    (org-element-contents (org-export-get-parent blob))))))
+	    ;; An object can belong to the contents of its parent or
+	    ;; to a secondary string.  We check the latter option
+	    ;; first.
+	    (let ((parent (org-export-get-parent blob)))
+	      (or (and (not (memq (org-element-type blob)
+				  org-element-all-elements))
+		       (let ((sec-value
+			      (org-element-property
+			       (cdr (assq (org-element-type parent)
+					  org-element-secondary-value-alist))
+			       parent)))
+			 (and (memq blob sec-value) sec-value)))
+		  (org-element-contents parent)))))))
 
 (defun org-export-get-next-element (blob info)
   "Return next element or object.
@@ -4474,7 +4486,18 @@ object, a string, or nil."
     (mapc (lambda (obj)
 	    (unless (memq obj (plist-get info :ignore-list))
 	      (throw 'found obj)))
-	  (cdr (memq blob (org-element-contents (org-export-get-parent blob)))))
+	  ;; An object can belong to the contents of its parent or to
+	  ;; a secondary string.  We check the latter option first.
+	  (let ((parent (org-export-get-parent blob)))
+	    (or (and (not (memq (org-element-type blob)
+				org-element-all-objects))
+		     (let ((sec-value
+			    (org-element-property
+			     (cdr (assq (org-element-type parent)
+					org-element-secondary-value-alist))
+			     parent)))
+		       (cdr (memq blob sec-value))))
+		(cdr (memq blob (org-element-contents parent))))))
     nil))
 
 

testing/lisp/test-org-export.el

@@ -1251,7 +1251,34 @@ Another text. (ref:text)
 	      (org-element-map
 	       tree 'plain-text
 	       (lambda (s) (org-export-activate-smart-quotes s :html info))
-	       info))))))
+	       info)))))
+  ;; Smart quotes in secondary strings.
+  (should
+   (equal '("“" "”")
+	  (let ((org-export-default-language "en"))
+	    (org-test-with-parsed-data "* \"$x$\""
+	      (org-element-map
+	       tree 'plain-text
+	       (lambda (s) (org-export-activate-smart-quotes s :html info))
+	       info)))))
+  ;; Smart quotes in document keywords.
+  (should
+   (equal '("“" "”")
+	  (let ((org-export-default-language "en"))
+	    (org-test-with-parsed-data "#+TITLE: \"$x$\""
+	      (org-element-map
+	       (plist-get info :title) 'plain-text
+	       (lambda (s) (org-export-activate-smart-quotes s :html info))
+	       info)))))
+  ;; Smart quotes in parsed affiliated keywords.
+  (should
+   (equal '("“" "”" "Paragraph")
+	  (let ((org-export-default-language "en"))
+	    (org-test-with-parsed-data "#+CAPTION: \"$x$\"\nParagraph"
+	      (org-element-map
+	       tree 'plain-text
+	       (lambda (s) (org-export-activate-smart-quotes s :html info))
+	       info nil nil t))))))
 
 
 
@@ -1817,7 +1844,29 @@ Another text. (ref:text)
    (let ((org-export-with-timestamps nil))
      (org-test-with-parsed-data "\alpha <2012-03-29 Thu>"
        (org-export-get-next-element
-	(org-element-map tree 'entity 'identity info t) info)))))
+	(org-element-map tree 'entity 'identity info t) info))))
+  ;; Find next element in secondary strings.
+  (should
+   (eq 'verbatim
+       (org-test-with-parsed-data "* a =verb="
+	 (org-element-type
+	  (org-export-get-next-element
+	   (org-element-map tree 'plain-text 'identity info t) info)))))
+  ;; Find next element in document keywords.
+  (should
+   (eq 'verbatim
+       (org-test-with-parsed-data "#+TITLE: a =verb="
+	 (org-element-type
+	  (org-export-get-next-element
+	   (org-element-map
+	    (plist-get info :title) 'plain-text 'identity info t) info)))))
+  ;; Find next element in parsed affiliated keywords.
+  (should
+   (eq 'verbatim
+       (org-test-with-parsed-data "#+CAPTION: a =verb=\nParagraph"
+	 (org-element-type
+	  (org-export-get-next-element
+	   (org-element-map tree 'plain-text 'identity info t nil t) info))))))
 
 (ert-deftest test-org-export/get-previous-element ()
   "Test `org-export-get-previous-element' specifications."
@@ -1837,7 +1886,29 @@ Another text. (ref:text)
    (let ((org-export-with-timestamps nil))
      (org-test-with-parsed-data "<2012-03-29 Thu> \alpha"
        (org-export-get-previous-element
-	(org-element-map tree 'entity 'identity info t) info)))))
+	(org-element-map tree 'entity 'identity info t) info))))
+  ;; Find previous element in secondary strings.
+  (should
+   (eq 'verbatim
+       (org-test-with-parsed-data "* =verb= a"
+	 (org-element-type
+	  (org-export-get-previous-element
+	   (org-element-map tree 'plain-text 'identity info t) info)))))
+  ;; Find previous element in document keywords.
+  (should
+   (eq 'verbatim
+       (org-test-with-parsed-data "#+TITLE: =verb= a"
+	 (org-element-type
+	  (org-export-get-previous-element
+	   (org-element-map
+	    (plist-get info :title) 'plain-text 'identity info t) info)))))
+  ;; Find previous element in parsed affiliated keywords.
+  (should
+   (eq 'verbatim
+       (org-test-with-parsed-data "#+CAPTION: =verb= a\nParagraph"
+	 (org-element-type
+	  (org-export-get-previous-element
+	   (org-element-map tree 'plain-text 'identity info t nil t) info))))))
 
 
 (provide 'test-org-export)