Avoid confusing message in Ibuffer (bug#64230)

* lisp/ibuffer.el (ibuffer-map-lines): With `ibuffer-auto-mode'
enabled, Ibuffer counts the automatically popped up (and hence not
user-marked) buffer "*Ibuffer confirmation*".  Since Ibuffer
reports how many user-marked buffers were acted upon, and in this
case the reported count would be too high by one, decrement the
count to avoid the confusing message.

1 files changed, 12 insertions, 2 deletions

diff --git a/lisp/ibuffer.el b/lisp/ibuffer.el
index a26bb1811ec..b5a7f2d04e0 100644
--- a/lisp/ibuffer.el
+++ b/lisp/ibuffer.el
@@ -1872,7 +1872,8 @@ the buffer object itself and the current mark symbol."
             (let ((result
                    (if (buffer-live-p (ibuffer-current-buffer))
                        (when (or (null group)
-                                 (when-let ((it (get-text-property (point) 'ibuffer-filter-group)))
+                                 (when-let ((it (get-text-property
+                                                 (point) 'ibuffer-filter-group)))
                                    (equal group it)))
                          (save-excursion
                            (funcall function
@@ -1897,7 +1898,16 @@ the buffer object itself and the current mark symbol."
                     (t
                      (cl-incf ibuffer-map-lines-count)
                      (forward-line 1)))))
-          ibuffer-map-lines-count)
+          ;; With `ibuffer-auto-mode' enabled, the preceding loop
+          ;; counts the automatically popped up (and hence not
+          ;; user-marked) buffer "*Ibuffer confirmation*".  Since
+          ;; Ibuffer reports how many user-marked buffers were acted
+          ;; upon, and in this case the reported count would be too
+          ;; high by one, we decrement the count to avoid the
+          ;; confusing message (see bug#64230).
+          (if (and (featurep 'ibuf-ext) ibuffer-auto-mode)
+              (1- ibuffer-map-lines-count)
+            ibuffer-map-lines-count))
       (progn
         (setq buffer-read-only t)
         (unless nomodify