org.el (org-indent-line-function): Fix bug.

* org.el (org-indent-line-function): Fix bug.

Don't fall back systematically on `org-fb-vars' to do
the indentation.  Only fall back at then end, when no
modification has been done by indenting a la Org.  In
that case, use `indent-according-to-mode' instead of
using `indent-line-function' to avoid a possible loop.

Thanks to Eric Fraga, Christopher Schmidt and Nicolas
Goaziou who reported problems with this.

lisp/org.el

@@ -20426,116 +20426,116 @@ If point is in an inline task, mark that task instead."
 (defun org-indent-line-function ()
   "Indent line depending on context."
   (interactive)
-  (if orgstruct-is-++
-      (orgstruct++-ignore-org-filling
-       (funcall indent-line-function))
-    (let* ((pos (point))
-	   (itemp (org-at-item-p))
-	   (case-fold-search t)
-	   (org-drawer-regexp (or org-drawer-regexp "\000"))
-	   (inline-task-p (and (featurep 'org-inlinetask)
-			       (org-inlinetask-in-task-p)))
-	   (inline-re (and inline-task-p
-			   (org-inlinetask-outline-regexp)))
-	   column)
-      (beginning-of-line 1)
+  (let* ((pos (point))
+	 (itemp (org-at-item-p))
+	 (case-fold-search t)
+	 (org-drawer-regexp (or org-drawer-regexp "\000"))
+	 (inline-task-p (and (featurep 'org-inlinetask)
+			     (org-inlinetask-in-task-p)))
+	 (inline-re (and inline-task-p
+			 (org-inlinetask-outline-regexp)))
+	 column)
+    (beginning-of-line 1)
+    (cond
+     ;; Comments
+     ((looking-at "# ") (setq column 0))
+     ;; Headings
+     ((looking-at org-outline-regexp) (setq column 0))
+     ;; Included files
+     ((looking-at "#\\+include:") (setq column 0))
+     ;; Footnote definition
+     ((looking-at org-footnote-definition-re) (setq column 0))
+     ;; Literal examples
+     ((looking-at "[ \t]*:\\( \\|$\\)")
+      (setq column (org-get-indentation))) ; do nothing
+     ;; Lists
+     ((ignore-errors (goto-char (org-in-item-p)))
+      (setq column (if itemp
+		       (org-get-indentation)
+		     (org-list-item-body-column (point))))
+      (goto-char pos))
+     ;; Drawers
+     ((and (looking-at "[ \t]*:END:")
+	   (save-excursion (re-search-backward org-drawer-regexp nil t)))
+      (save-excursion
+	(goto-char (1- (match-beginning 1)))
+	(setq column (current-column))))
+     ;; Special blocks
+     ((and (looking-at "[ \t]*#\\+end_\\([a-z]+\\)")
+	   (save-excursion
+	     (re-search-backward
+	      (concat "^[ \t]*#\\+begin_" (downcase (match-string 1))) nil t)))
+      (setq column (org-get-indentation (match-string 0))))
+     ((and (not (looking-at "[ \t]*#\\+begin_"))
+	   (org-between-regexps-p "^[ \t]*#\\+begin_" "[ \t]*#\\+end_"))
+      (save-excursion
+	(re-search-backward "^[ \t]*#\\+begin_\\([a-z]+\\)" nil t))
+      (setq column
+	    (cond ((equal (downcase (match-string 1)) "src")
+		   ;; src blocks: let `org-edit-src-exit' handle them
+		   (org-get-indentation))
+		  ((equal (downcase (match-string 1)) "example")
+		   (max (org-get-indentation)
+			(org-get-indentation (match-string 0))))
+		  (t
+		   (org-get-indentation (match-string 0))))))
+     ;; This line has nothing special, look at the previous relevant
+     ;; line to compute indentation
+     (t
+      (beginning-of-line 0)
+      (while (and (not (bobp))
+		  (not (looking-at org-drawer-regexp))
+		  ;; When point started in an inline task, do not move
+		  ;; above task starting line.
+		  (not (and inline-task-p (looking-at inline-re)))
+		  ;; Skip drawers, blocks, empty lines, verbatim,
+		  ;; comments, tables, footnotes definitions, lists,
+		  ;; inline tasks.
+		  (or (and (looking-at "[ \t]*:END:")
+			   (re-search-backward org-drawer-regexp nil t))
+		      (and (looking-at "[ \t]*#\\+end_")
+			   (re-search-backward "[ \t]*#\\+begin_"nil t))
+		      (looking-at "[ \t]*[\n:#|]")
+		      (looking-at org-footnote-definition-re)
+		      (and (ignore-errors (goto-char (org-in-item-p)))
+			   (goto-char
+			    (org-list-get-top-point (org-list-struct))))
+		      (and (not inline-task-p)
+			   (featurep 'org-inlinetask)
+			   (org-inlinetask-in-task-p)
+			   (or (org-inlinetask-goto-beginning) t))))
+	(beginning-of-line 0))
       (cond
-       ;; Comments
-       ((looking-at "# ") (setq column 0))
-       ;; Headings
-       ((looking-at org-outline-regexp) (setq column 0))
-       ;; Included files
-       ((looking-at "#\\+include:") (setq column 0))
-       ;; Footnote definition
-       ((looking-at org-footnote-definition-re) (setq column 0))
-       ;; Literal examples
-       ((looking-at "[ \t]*:\\( \\|$\\)")
-	(setq column (org-get-indentation))) ; do nothing
-       ;; Lists
-       ((ignore-errors (goto-char (org-in-item-p)))
-	(setq column (if itemp
-			 (org-get-indentation)
-		       (org-list-item-body-column (point))))
-	(goto-char pos))
-       ;; Drawers
-       ((and (looking-at "[ \t]*:END:")
-	     (save-excursion (re-search-backward org-drawer-regexp nil t)))
-	(save-excursion
-	  (goto-char (1- (match-beginning 1)))
+       ;; There was an heading above.
+       ((looking-at "\\*+[ \t]+")
+	(if (not org-adapt-indentation)
+	    (setq column 0)
+	  (goto-char (match-end 0))
 	  (setq column (current-column))))
-       ;; Special blocks
-       ((and (looking-at "[ \t]*#\\+end_\\([a-z]+\\)")
-	     (save-excursion
-	       (re-search-backward
-		(concat "^[ \t]*#\\+begin_" (downcase (match-string 1))) nil t)))
-	(setq column (org-get-indentation (match-string 0))))
-       ((and (not (looking-at "[ \t]*#\\+begin_"))
-	     (org-between-regexps-p "^[ \t]*#\\+begin_" "[ \t]*#\\+end_"))
-	(save-excursion
-	  (re-search-backward "^[ \t]*#\\+begin_\\([a-z]+\\)" nil t))
-	(setq column
-	      (cond ((equal (downcase (match-string 1)) "src")
-		     ;; src blocks: let `org-edit-src-exit' handle them
-		     (org-get-indentation))
-		    ((equal (downcase (match-string 1)) "example")
-		     (max (org-get-indentation)
-			  (org-get-indentation (match-string 0))))
-		    (t
-		     (org-get-indentation (match-string 0))))))
-       ;; This line has nothing special, look at the previous relevant
-       ;; line to compute indentation
-       (t
-	(beginning-of-line 0)
-	(while (and (not (bobp))
-		    (not (looking-at org-drawer-regexp))
-		    ;; When point started in an inline task, do not move
-		    ;; above task starting line.
-		    (not (and inline-task-p (looking-at inline-re)))
-		    ;; Skip drawers, blocks, empty lines, verbatim,
-		    ;; comments, tables, footnotes definitions, lists,
-		    ;; inline tasks.
-		    (or (and (looking-at "[ \t]*:END:")
-			     (re-search-backward org-drawer-regexp nil t))
-			(and (looking-at "[ \t]*#\\+end_")
-			     (re-search-backward "[ \t]*#\\+begin_"nil t))
-			(looking-at "[ \t]*[\n:#|]")
-			(looking-at org-footnote-definition-re)
-			(and (ignore-errors (goto-char (org-in-item-p)))
-			     (goto-char
-			      (org-list-get-top-point (org-list-struct))))
-			(and (not inline-task-p)
-			     (featurep 'org-inlinetask)
-			     (org-inlinetask-in-task-p)
-			     (or (org-inlinetask-goto-beginning) t))))
-	  (beginning-of-line 0))
-	(cond
-	 ;; There was an heading above.
-	 ((looking-at "\\*+[ \t]+")
-	  (if (not org-adapt-indentation)
-	      (setq column 0)
-	    (goto-char (match-end 0))
-	    (setq column (current-column))))
-	 ;; A drawer had started and is unfinished
-	 ((looking-at org-drawer-regexp)
-	  (goto-char (1- (match-beginning 1)))
-	  (setq column (current-column)))
-	 ;; Else, nothing noticeable found: get indentation and go on.
-	 (t (setq column (org-get-indentation))))))
-      ;; Now apply indentation and move cursor accordingly
-      (goto-char pos)
-      (if (<= (current-column) (current-indentation))
-	  (org-indent-line-to column)
-	(save-excursion (org-indent-line-to column)))
-      ;; Special polishing for properties, see `org-property-format'
-      (setq column (current-column))
-      (beginning-of-line 1)
-      (if (looking-at
-	   "\\([ \t]+\\)\\(:[-_0-9a-zA-Z]+:\\)[ \t]*\\(\\S-.*\\(\\S-\\|$\\)\\)")
-	  (replace-match (concat (match-string 1)
-				 (format org-property-format
-					 (match-string 2) (match-string 3)))
-			 t t))
-      (org-move-to-column column))))
+       ;; A drawer had started and is unfinished
+       ((looking-at org-drawer-regexp)
+	(goto-char (1- (match-beginning 1)))
+	(setq column (current-column)))
+       ;; Else, nothing noticeable found: get indentation and go on.
+       (t (setq column (org-get-indentation))))))
+    ;; Now apply indentation and move cursor accordingly
+    (goto-char pos)
+    (if (<= (current-column) (current-indentation))
+	(org-indent-line-to column)
+      (save-excursion (org-indent-line-to column)))
+    ;; Special polishing for properties, see `org-property-format'
+    (setq column (current-column))
+    (beginning-of-line 1)
+    (if (looking-at
+	 "\\([ \t]+\\)\\(:[-_0-9a-zA-Z]+:\\)[ \t]*\\(\\S-.*\\(\\S-\\|$\\)\\)")
+	(replace-match (concat (match-string 1)
+			       (format org-property-format
+				       (match-string 2) (match-string 3)))
+		       t t))
+    (org-move-to-column column)
+    (when (and orgstruct-is-++ (eq pos (point)))
+      (orgstruct++-ignore-org-filling
+       (indent-according-to-mode)))))
 
 (defun org-indent-drawer ()
   "Indent the drawer at point."