emacs-27 2c31ce1: Fix 'message' when there's active minibuffer on another frame

[Eli Zaretskii]

branch: emacs-27
commit 2c31ce18eaa4710e6ff1d73c82432f218ded7c45
Author: Gregory Heytings <ghe@sdf.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Fix 'message' when there's active minibuffer on another frame
    
    * lisp/minibuffer.el (set-minibuffer-message): Don't reuse the
    active minibuffer for displaying messages unless the active
    minibuffer is on the same frame as the selected window.
    
    Copyright-paperwork-exempt: yes
---
 lisp/minibuffer.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
index f6e2b23..10cfca8 100644
--- a/lisp/minibuffer.el
+++ b/lisp/minibuffer.el
@@ -784,7 +784,8 @@ whichever comes first.
 Unlike `minibuffer-message', this function is called automatically
 via `set-message-function'."
   (when (and (not noninteractive)
-             (window-live-p (active-minibuffer-window)))
+             (window-live-p (active-minibuffer-window))
+             (eq (window-frame) (window-frame (active-minibuffer-window))))
     (with-current-buffer (window-buffer (active-minibuffer-window))
       (setq message (if (string-match-p "\\` *\\[.+\\]\\'" message)
                         ;; Make sure we can put-text-property.