In 'minibuffer--nonselected-check' consult 'completion-reference-buffer'

* lisp/minibuffer.el (minibuffer--nonselected-check): Don't
highlight when the selected window's buffer has
'completion-reference-buffer' set.

1 files changed, 11 insertions, 4 deletions

diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
index d92dc6615ca..0c06760a678 100644
--- a/lisp/minibuffer.el
+++ b/lisp/minibuffer.el
@@ -5654,17 +5654,24 @@ Used by `minibuffer-nonselected-mode'.")
 (defun minibuffer--nonselected-check (_frame)
   "Check if active minibuffer window is no longer selected.
 Use overlay to highlight its contents when another window is selected.
-But don't highlight when the *Completions* window is selected."
+But don't highlight when the *Completions* window is selected or the
+buffer-loval value of `completion-reference-buffer' in the selected
+window's buffer equals the buffer of the active minibuffer window."
   (let* ((active-minibuffer-window (active-minibuffer-window))
          (active-minibuffer (when active-minibuffer-window
                               (window-buffer active-minibuffer-window))))
     (cond
      ((or (not active-minibuffer-window)
           (eq active-minibuffer-window (selected-window))
-          (equal (buffer-name (window-buffer)) "*Completions*"))
+          (equal (buffer-name (window-buffer)) "*Completions*")
+          (eq (buffer-local-value
+               'completion-reference-buffer (window-buffer))
+              active-minibuffer))
       ;; When there's no active minibuffer window or either the
-      ;; minibuffer or *the Completions* window is selected, remove the
-      ;; overlay if it exists.
+      ;; minibuffer or the *Completions* window is selected or the
+      ;; buffer-loval value of 'completion-reference-buffer' in the
+      ;; selected window's buffer equals the buffer of the active
+      ;; minibuffer window, remove the overlay if it exists.
       (when minibuffer--nonselected-overlay
         (delete-overlay minibuffer--nonselected-overlay)))
      ((not minibuffer--nonselected-overlay)