Fix radio target parsing

* lisp/org-element.el (org-element-all-successors,
  org-element-object-restrictions): Prioritize `link' over other
  successors in order to find radio links starting with another syntax
  object (e.g., an entity).  Also allow text markup within radio
  targets.
(org-element-link-parser): Add contents to radio targets.

* lisp/org.el (org-make-target-link-regexp): Fix regexp so it can
  match targets starting with an Org object (e.g., an entity).
(org-ctrl-c-ctrl-c): Fix function when applied on an object contained
within a radio target.

* testing/lisp/test-org-element.el (test-org-element/radio-target-parser): Add test.
* testing/lisp/test-ox.el (test-org-export/resolve-radio-link): Add test.

lisp/org-element.el

@@ -187,10 +187,10 @@ is not sufficient to know if point is at a paragraph ending.  See
   "List of recursive element types aka Greater Elements.")
 
 (defconst org-element-all-successors
-  '(export-snippet footnote-reference inline-babel-call inline-src-block
-		   latex-or-entity line-break link macro plain-link radio-target
-		   statistics-cookie sub/superscript table-cell target
-		   text-markup timestamp)
+  '(link export-snippet footnote-reference inline-babel-call
+	 inline-src-block latex-or-entity line-break macro plain-link
+	 radio-target statistics-cookie sub/superscript table-cell target
+	 text-markup timestamp)
   "Complete list of successors.")
 
 (defconst org-element-object-successor-alist
@@ -328,13 +328,13 @@ Don't modify it, set `org-element-affiliated-keywords' instead.")
       (paragraph ,@standard-set)
       ;; Remove any variable object from radio target as it would
       ;; prevent it from being properly recognized.
-      (radio-target latex-or-entity sub/superscript)
+      (radio-target latex-or-entity sub/superscript text-markup)
       (strike-through ,@standard-set)
       (subscript ,@standard-set)
       (superscript ,@standard-set)
       ;; Ignore inline babel call and inline src block as formulas are
       ;; possible.  Also ignore line breaks and statistics cookies.
-      (table-cell export-snippet footnote-reference latex-or-entity link macro
+      (table-cell link export-snippet footnote-reference latex-or-entity macro
 		  radio-target sub/superscript target text-markup timestamp)
       (table-row table-cell)
       (underline ,@standard-set)
@@ -346,7 +346,8 @@ a list of successors that will be called within an element or
 object of such type.
 
 For example, in a `radio-target' object, one can only find
-entities, latex-fragments, subscript and superscript.
+entities, latex-fragments, subscript, superscript and text
+markup.
 
 This alist also applies to secondary string.  For example, an
 `headline' type element doesn't directly contain objects, but
@@ -3095,7 +3096,9 @@ Assume point is at the beginning of the link."
        ((and org-target-link-regexp (looking-at org-target-link-regexp))
 	(setq type "radio"
 	      link-end (match-end 0)
-	      path (org-match-string-no-properties 0)))
+	      path (org-match-string-no-properties 0)
+	      contents-begin (match-beginning 0)
+	      contents-end (match-end 0)))
        ;; Type 2: Standard link, i.e. [[http://orgmode.org][homepage]]
        ((looking-at org-bracket-link-regexp)
 	(setq contents-begin (match-beginning 3)

lisp/org.el

@@ -6097,7 +6097,7 @@ The regular expression finds the targets also if there is a line break
 between words."
   (and targets
        (concat
-	"\\<\\("
+	"\\_<\\("
 	(mapconcat
 	 (lambda (x)
 	   (setq x (regexp-quote x))
@@ -6106,7 +6106,7 @@ between words."
 	   x)
 	 targets
 	 "\\|")
-	"\\)\\>")))
+	"\\)\\_>")))
 
 (defun org-activate-tags (limit)
   (if (re-search-forward (org-re "^\\*+.*[ \t]\\(:[[:alnum:]_@#%:]+:\\)[ \r\n]") limit t)
@@ -20262,13 +20262,15 @@ This command does many different things, depending on context:
 	  ;; When at a link, act according to the parent instead.
 	  (link (setq context (org-element-property :parent context))
 		(setq type (org-element-type context)))
-	  ;; Unsupported object types: check parent element instead.
+	  ;; Unsupported object types: refer to the first supported
+	  ;; element or object containing it.
 	  ((bold code entity export-snippet inline-babel-call inline-src-block
 		 italic latex-fragment line-break macro strike-through subscript
 		 superscript underline verbatim)
 	   (while (and (setq context (org-element-property :parent context))
 		       (not (memq (setq type (org-element-type context))
-				  '(paragraph verse-block table-cell)))))))
+				  '(radio-target paragraph verse-block
+						 table-cell)))))))
 	;; For convenience: at the first line of a paragraph on the
 	;; same line as an item, apply function on that item instead.
 	(when (eq type 'paragraph)

testing/lisp/test-org-element.el

@@ -1688,12 +1688,19 @@ Outside list"
   "Test `radio-target' parser."
   ;; Standard test.
   (should
-   (org-test-with-temp-text "<<<radio>>>"
-     (org-element-map (org-element-parse-buffer) 'radio-target 'identity)))
+   (eq 'radio-target
+       (org-test-with-temp-text "<<<radio>>>"
+	 (org-element-type (org-element-context)))))
   ;; Radio targets with objects.
   (should
-   (org-test-with-temp-text "<<<radio \\alpha>>>"
-     (org-element-map (org-element-parse-buffer) 'radio-target 'identity))))
+   (eq 'radio-target
+       (org-test-with-temp-text "<<<radio \\alpha>>>"
+	 (org-element-type (org-element-context)))))
+  ;; Radio targets starting with an object.
+  (should
+   (eq 'radio-target
+       (org-test-with-temp-text "<<<\\alpha radio>>>"
+	 (org-element-type (org-element-context))))))
 
 
 ;;;; Section

testing/lisp/test-ox.el

@@ -1858,6 +1858,15 @@ Another text. (ref:text)
        (org-export-resolve-radio-link
 	(org-element-map tree 'link 'identity info t)
 	info))))
+  ;; Radio target with objects at its beginning.
+  (should
+   (org-test-with-temp-text "<<<\\alpha radio>>> \\alpha radio"
+     (org-update-radio-target-regexp)
+     (let* ((tree (org-element-parse-buffer))
+	    (info `(:parse-tree ,tree)))
+       (org-export-resolve-radio-link
+	(org-element-map tree 'link 'identity info t)
+	info))))
   ;; Multiple radio targets.
   (should
    (equal '("radio1" "radio2")