Only treat display strings as buttons if they have 'button' property

* lisp/button.el (push-button): Use 'posn-point' instead of
'posn-string' if the string doesn't have the 'button'
property (Bug#40859).

1 files changed, 6 insertions, 4 deletions

diff --git a/lisp/button.el b/lisp/button.el
index b3afc4eca25..3a6a6de774c 100644
--- a/lisp/button.el
+++ b/lisp/button.el
@@ -469,10 +469,12 @@ return t."
       ;; POS is a mouse event; switch to the proper window/buffer
       (let ((posn (event-start pos)))
         (with-current-buffer (window-buffer (posn-window posn))
-          (if (posn-string posn)
-              ;; mode-line, header-line, or display string event.
-              (button-activate (posn-string posn) t)
-            (push-button (posn-point posn) t))))
+          (let* ((str (posn-string posn))
+                 (str-button (and str (get-text-property (cdr str) 'button (car str)))))
+            (if str-button
+                ;; mode-line, header-line, or display string event.
+                (button-activate str t)
+              (push-button (posn-point posn) t)))))
     ;; POS is just normal position
     (let ((button (button-at (or pos (point)))))
       (when button