Allow setting tags for headlines in the active region.

* org.el (org-set-tags): Allow setting tags for headlines in
the region when `org-loop-over-headlines-in-active-region' is
non-nil.

lisp/org.el

@@ -13490,94 +13490,104 @@ If DATA is nil or the empty string, any tags will be removed."
   "Set the tags for the current headline.
 With prefix ARG, realign all tags in headings in the current buffer."
   (interactive "P")
-  (let* ((re org-outline-regexp-bol)
-	 (current (unless arg (org-get-tags-string)))
-	 (col (current-column))
-	 (org-setting-tags t)
-	 table current-tags inherited-tags ; computed below when needed
-	 tags p0 c0 c1 rpl di tc level)
-    (if arg
-	(save-excursion
-	  (goto-char (point-min))
-	  (let ((buffer-invisibility-spec (org-inhibit-invisibility)))
-	    (while (re-search-forward re nil t)
-	      (org-set-tags nil t)
-	      (end-of-line 1)))
-	  (message "All tags realigned to column %d" org-tags-column))
-      (if just-align
-	  (setq tags current)
-	;; Get a new set of tags from the user
-	(save-excursion
-	  (setq table (append org-tag-persistent-alist
-			      (or org-tag-alist (org-get-buffer-tags))
-			      (and
-			       org-complete-tags-always-offer-all-agenda-tags
-			       (org-global-tags-completion-table
-				(org-agenda-files))))
-		org-last-tags-completion-table table
-		current-tags (org-split-string current ":")
-		inherited-tags (nreverse
-				(nthcdr (length current-tags)
-					(nreverse (org-get-tags-at))))
-		tags
-		(if (or (eq t org-use-fast-tag-selection)
-			(and org-use-fast-tag-selection
-			     (delq nil (mapcar 'cdr table))))
-		    (org-fast-tag-selection
-		     current-tags inherited-tags table
-		     (if org-fast-tag-selection-include-todo
-			 org-todo-key-alist))
-		  (let ((org-add-colon-after-tag-completion (< 1 (length table))))
-		    (org-trim
-		     (org-icompleting-read "Tags: "
-					   'org-tags-completion-function
-					   nil nil current 'org-tags-history))))))
-	(while (string-match "[-+&]+" tags)
-	  ;; No boolean logic, just a list
-	  (setq tags (replace-match ":" t t tags))))
-
-      (setq tags (replace-regexp-in-string "[,]" ":" tags))
-
-      (if org-tags-sort-function
-      	  (setq tags (mapconcat 'identity
-      				(sort (org-split-string
-				       tags (org-re "[^[:alnum:]_@#%]+"))
-      				      org-tags-sort-function) ":")))
-
-      (if (string-match "\\`[\t ]*\\'" tags)
-	  (setq tags "")
-	(unless (string-match ":$" tags) (setq tags (concat tags ":")))
-	(unless (string-match "^:" tags) (setq tags (concat ":" tags))))
-
-      ;; Insert new tags at the correct column
-      (beginning-of-line 1)
-      (setq level (or (and (looking-at org-outline-regexp)
-			   (- (match-end 0) (point) 1))
-		      1))
-      (cond
-       ((and (equal current "") (equal tags "")))
-       ((re-search-forward
-	 (concat "\\([ \t]*" (regexp-quote current) "\\)[ \t]*$")
-	 (point-at-eol) t)
-	(if (equal tags "")
-	    (setq rpl "")
-	  (goto-char (match-beginning 0))
-	  (setq c0 (current-column)
-		;; compute offset for the case of org-indent-mode active
-		di (if org-indent-mode
-		       (* (1- org-indent-indentation-per-level) (1- level))
-		     0)
-		p0 (if (equal (char-before) ?*) (1+ (point)) (point))
-		tc (+ org-tags-column (if (> org-tags-column 0) (- di) di))
-		c1 (max (1+ c0) (if (> tc 0) tc (- (- tc) (length tags))))
-		rpl (concat (make-string (max 0 (- c1 c0)) ?\ ) tags)))
-	(replace-match rpl t t)
-	(and (not (featurep 'xemacs)) c0 indent-tabs-mode (tabify p0 (point)))
-	tags)
-       (t (error "Tags alignment failed")))
-      (org-move-to-column col)
-      (unless just-align
-	(run-hooks 'org-after-tags-change-hook)))))
+  (if (and (org-region-active-p) org-loop-over-headlines-in-active-region)
+      (let ((cl (if (eq org-loop-over-headlines-in-active-region 'start-level)
+		    'region-start-level 'region))
+	    org-loop-over-headlines-in-active-region)
+	(org-map-entries
+	 ;; We don't use ARG and JUST-ALIGN here these args are not
+	 ;; useful when looping over headlines
+	 `(org-set-tags)
+	 org-loop-over-headlines-in-active-region
+	 cl (if (outline-invisible-p) (org-end-of-subtree nil t))))
+    (let* ((re org-outline-regexp-bol)
+	   (current (unless arg (org-get-tags-string)))
+	   (col (current-column))
+	   (org-setting-tags t)
+	   table current-tags inherited-tags ; computed below when needed
+	   tags p0 c0 c1 rpl di tc level)
+      (if arg
+	  (save-excursion
+	    (goto-char (point-min))
+	    (let ((buffer-invisibility-spec (org-inhibit-invisibility)))
+	      (while (re-search-forward re nil t)
+		(org-set-tags nil t)
+		(end-of-line 1)))
+	    (message "All tags realigned to column %d" org-tags-column))
+	(if just-align
+	    (setq tags current)
+	  ;; Get a new set of tags from the user
+	  (save-excursion
+	    (setq table (append org-tag-persistent-alist
+				(or org-tag-alist (org-get-buffer-tags))
+				(and
+				 org-complete-tags-always-offer-all-agenda-tags
+				 (org-global-tags-completion-table
+				  (org-agenda-files))))
+		  org-last-tags-completion-table table
+		  current-tags (org-split-string current ":")
+		  inherited-tags (nreverse
+				  (nthcdr (length current-tags)
+					  (nreverse (org-get-tags-at))))
+		  tags
+		  (if (or (eq t org-use-fast-tag-selection)
+			  (and org-use-fast-tag-selection
+			       (delq nil (mapcar 'cdr table))))
+		      (org-fast-tag-selection
+		       current-tags inherited-tags table
+		       (if org-fast-tag-selection-include-todo
+			   org-todo-key-alist))
+		    (let ((org-add-colon-after-tag-completion (< 1 (length table))))
+		      (org-trim
+		       (org-icompleting-read "Tags: "
+					     'org-tags-completion-function
+					     nil nil current 'org-tags-history))))))
+	  (while (string-match "[-+&]+" tags)
+	    ;; No boolean logic, just a list
+	    (setq tags (replace-match ":" t t tags))))
+
+	(setq tags (replace-regexp-in-string "[,]" ":" tags))
+
+	(if org-tags-sort-function
+	    (setq tags (mapconcat 'identity
+				  (sort (org-split-string
+					 tags (org-re "[^[:alnum:]_@#%]+"))
+					org-tags-sort-function) ":")))
+
+	(if (string-match "\\`[\t ]*\\'" tags)
+	    (setq tags "")
+	  (unless (string-match ":$" tags) (setq tags (concat tags ":")))
+	  (unless (string-match "^:" tags) (setq tags (concat ":" tags))))
+
+	;; Insert new tags at the correct column
+	(beginning-of-line 1)
+	(setq level (or (and (looking-at org-outline-regexp)
+			     (- (match-end 0) (point) 1))
+			1))
+	(cond
+	 ((and (equal current "") (equal tags "")))
+	 ((re-search-forward
+	   (concat "\\([ \t]*" (regexp-quote current) "\\)[ \t]*$")
+	   (point-at-eol) t)
+	  (if (equal tags "")
+	      (setq rpl "")
+	    (goto-char (match-beginning 0))
+	    (setq c0 (current-column)
+		  ;; compute offset for the case of org-indent-mode active
+		  di (if org-indent-mode
+			 (* (1- org-indent-indentation-per-level) (1- level))
+		       0)
+		  p0 (if (equal (char-before) ?*) (1+ (point)) (point))
+		  tc (+ org-tags-column (if (> org-tags-column 0) (- di) di))
+		  c1 (max (1+ c0) (if (> tc 0) tc (- (- tc) (length tags))))
+		  rpl (concat (make-string (max 0 (- c1 c0)) ?\ ) tags)))
+	  (replace-match rpl t t)
+	  (and (not (featurep 'xemacs)) c0 indent-tabs-mode (tabify p0 (point)))
+	  tags)
+	 (t (error "Tags alignment failed")))
+	(org-move-to-column col)
+	(unless just-align
+	  (run-hooks 'org-after-tags-change-hook))))))
 
 (defun org-change-tag-in-region (beg end tag off)
   "Add or remove TAG for each entry in the region.