org.el: RET breaks headline text

* org.el (org-return): RET breaks headline text.
* test-org.el (test-org/return): Test org-return on headline text.
* ORG-NEWS: Add entry on new org-return behavior.

etc/ORG-NEWS

@@ -93,6 +93,9 @@ functions.  The Org version of these functions skips over inline tasks
 *** ~org-element-context~ no longer return objects in keywords
 ~org-element-context~ used to return objects on some keywords, i.e.,
 =TITLE=, =DATE= and =AUTHOR=.  It now returns only the keyword.
+*** Behavior of ~org-return~ changed
+If point is before or after the headline title, insert newline without
+changing the headline.
 ** Removed functions
 *** Removed function ~org-translate-time~
 Use ~org-timestamp-translate~ instead.

lisp/org.el

@@ -21185,16 +21185,36 @@ will not happen if point is in a table or on a \"dead\"
 object (e.g., within a comment).  In these case, you need to use
 `org-open-at-point' directly."
   (interactive)
-  (if (and (save-excursion
-	     (beginning-of-line)
-	     (looking-at org-todo-line-regexp))
-	   (match-beginning 3)
-	   (>= (point) (match-beginning 3)))
-      ;; Point is on headline tags.  Do not break them: add a newline
-      ;; after the headline instead.
-      (progn (org-show-entry)
+  (if (and (not (bolp))
+	   (save-excursion (beginning-of-line)
+			   (looking-at org-complex-heading-regexp)))
+      ;; At headline.
+      (let ((tags-column (when (match-beginning 5)
+			   (save-excursion (goto-char (match-beginning 5))
+					   (current-column))))
+	    ;; Test if before or after headline title.
+	    (string (when (not (or (< (point)
+				      (or (match-end 3)
+					  (match-end 2)
+					  (save-excursion
+					    (goto-char (match-beginning 4))
+					    (skip-chars-backward " \t")
+					    (point))))
+				   (and (match-beginning 5)
+					(>= (point) (match-beginning 5)))))
+		      ;; Point is on headline keywords, tags or cookies.  Do not break
+		      ;; them: add a newline after the headline instead.
+		      (org-string-nw-p
+		       (delete-and-extract-region (point) (match-end 4))))))
+	;; Adjust alignment of tags.
+	(when (and tags-column string)
+	  (org-align-tags-here (if org-auto-align-tags
+				   org-tags-column
+				 tags-column)))
 	(end-of-line)
-	     (if indent (newline-and-indent) (newline)))
+	(org-show-entry)
+	(if indent (newline-and-indent) (newline))
+	(and string (save-excursion (insert (org-trim string)))))
     (let* ((context (if org-return-follows-link (org-element-context)
 		      (org-element-at-point)))
 	   (type (org-element-type context)))

testing/lisp/test-org.el

@@ -834,7 +834,7 @@
 ;;; Editing
 
 (ert-deftest test-org/return ()
-  "Test RET (`org-return') specifications."
+  "Test `org-return' specifications."
   ;; Regular test.
   (should
    (equal "Para\ngraph"
@@ -878,11 +878,36 @@
 	  (org-test-with-temp-text "- A\n<point>- B"
 	    (org-return t)
 	    (buffer-string))))
-  ;; Special case: on tags part of a headline, add a newline below it
-  ;; instead of breaking it.
+  ;; On tags part of a headline, add a newline below it instead of
+  ;; breaking it.
   (should
    (equal "* H :tag:\n"
 	  (org-test-with-temp-text "* H :<point>tag:"
+	    (org-return)
+	    (buffer-string))))
+  ;; Before headline text, add a newline below it instead of breaking
+  ;; it.
+  (should
+   (equal "* TODO H :tag:\n"
+	  (org-test-with-temp-text "* <point>TODO H :tag:"
+	    (org-return)
+	    (buffer-string))))
+  (should
+   (equal "* TODO [#B] H :tag:\n"
+	  (org-test-with-temp-text "* TODO<point> [#B] H :tag:"
+	    (org-return)
+	    (buffer-string))))
+  ;; At headline text, break headline text but preserve tags.
+  (should
+   (equal "* TODO [#B] foo    :tag:\nbar"
+	  (let (org-auto-align-tags)
+	    (org-test-with-temp-text "* TODO [#B] foo<point>bar :tag:"
+	      (org-return)
+	      (buffer-string)))))
+  ;; At bol of headline insert newline.
+  (should
+   (equal "\n* h"
+	  (org-test-with-temp-text "<point>* h"
 	    (org-return)
 	    (buffer-string)))))