Backport commit 3739d51ef from Emacs

* lisp/org-agenda.el (org-agenda):
* lisp/org-clock.el (org-clock-out, org-clock-display):
* lisp/org.el (org-refile):
Don’t trust arbitrary strings to not contain "%" or "`" in
(message (concat STRING1 STRING2 ...)).

Be safer about "%" in message formats
3739d51ef3b935b30e40ba4534fe362bc685865f
Paul Eggert
Thu Mar 7 09:05:56 2019 -0800

lisp/org-agenda.el

@@ -2907,13 +2907,12 @@ Pressing `<' twice means to restrict to the current subtree or region
 	     (let* ((m (org-agenda-get-any-marker))
 		    (note (and m (org-entry-get m "THEFLAGGINGNOTE"))))
 	       (when note
-		 (message (concat
-			   "FLAGGING-NOTE ([?] for more info): "
+		 (message "FLAGGING-NOTE ([?] for more info): %s"
 			  (org-add-props
 			   (replace-regexp-in-string
 			    "\\\\n" "//"
 			    (copy-sequence note))
-			       nil 'face 'org-warning)))))))
+			   nil 'face 'org-warning))))))
 	 t t))
        ((equal org-keys "#") (call-interactively 'org-agenda-list-stuck-projects))
        ((equal org-keys "/") (call-interactively 'org-occur-in-agenda-files))

lisp/org-clock.el

@@ -1633,9 +1633,10 @@ to, overriding the existing value of `org-clock-out-switch-to-state'."
 						"\\>"))))
 		  (org-todo org-clock-out-switch-to-state))))))
 	  (force-mode-line-update)
-	  (message (concat "Clock stopped at %s after "
-			   (org-duration-from-minutes (+ (* 60 h) m)) "%s")
-		   te (if remove " => LINE REMOVED" ""))
+	  (message (if remove
+		       "Clock stopped at %s after %s => LINE REMOVED"
+		     "Clock stopped at %s after %s")
+		   te (org-duration-from-minutes (+ (* 60 h) m)))
 	  (run-hooks 'org-clock-out-hook)
 	  (unless (org-clocking-p)
 	    (setq org-clock-current-task nil)))))))
@@ -1934,13 +1935,14 @@ Use `\\[org-clock-remove-overlays]' to remove the subtree times."
 		    nil 'local))))
     (let* ((h (/ org-clock-file-total-minutes 60))
 	   (m (- org-clock-file-total-minutes (* 60 h))))
-      (message (concat (format "Total file time%s: "
-			       (cond (todayp " for today")
-				     (customp " (custom)")
-				     (t "")))
-		       (org-duration-from-minutes
-			org-clock-file-total-minutes)
-		       " (%d hours and %d minutes)")
+      (message (cond
+		(todayp
+		 "Total file time for today: %s (%d hours and %d minutes)")
+		(customp
+		 "Total file time (custom): %s (%d hours and %d minutes)")
+		(t
+		 "Total file time: %s (%d hours and %d minutes)"))
+	       (org-duration-from-minutes org-clock-file-total-minutes)
 	       h m))))
 
 (defvar-local org-clock-overlays nil)

lisp/org.el

@@ -11473,7 +11473,8 @@ prefix argument (`C-u C-u C-u C-c C-w')."
 	    (when (featurep 'org-inlinetask)
 	      (org-inlinetask-remove-END-maybe))
 	    (setq org-markers-to-move nil)
-	    (message (concat actionmsg " to \"%s\" in file %s: done") (car it) file)))))))
+	    (message "%s to \"%s\" in file %s: done" actionmsg
+		     (car it) file)))))))
 
 (defun org-refile-goto-last-stored ()
   "Go to the location where the last refile was stored."