Prevent eldoc from changing the mode line

* lisp/emacs-lisp/eldoc.el (eldoc-minibuffer-message): Don't
change the mode line if it is not displayed.  (Bug#28697)

diff --git a/lisp/emacs-lisp/eldoc.el b/lisp/emacs-lisp/eldoc.el
index cba9a00fa5a3ee4911da8364dee8e55f2db7fcf3..ad08977b81a2f03527dee50d947b6d2dcfd050a7 100644 (file)
--- a/lisp/emacs-lisp/eldoc.el
+++ b/lisp/emacs-lisp/eldoc.el
@@ -264,12 +264,13 @@ Otherwise work like `message'."
             (or (window-in-direction 'above (minibuffer-window))
                 (minibuffer-selected-window)
                 (get-largest-window)))
+    (when mode-line-format
          (unless (and (listp mode-line-format)
                       (assq 'eldoc-mode-line-string mode-line-format))
            (setq mode-line-format
                  (list "" '(eldoc-mode-line-string
                             (" " eldoc-mode-line-string " "))
-                       mode-line-format)))
+                       mode-line-format))))
           (setq eldoc-mode-line-string
                 (when (stringp format-string)
                   (apply #'format-message format-string args)))