(list-buffers-noselect): Turn also "\n" into a strech spec so it doesn't display

as "^J" on the header line when `Buffer-menu-use-header-line' is t.

1 files changed, 4 insertions, 3 deletions

diff --git a/lisp/buff-menu.el b/lisp/buff-menu.el
index 5388ff9863d..3094da3bfe8 100644
--- a/lisp/buff-menu.el
+++ b/lisp/buff-menu.el
@@ -706,9 +706,9 @@ For more information, see the function `buffer-menu'."
          list desired-point)
     (when Buffer-menu-use-header-line
       (let ((pos 0))
-        ;; Turn spaces in the header into stretch specs so they work
-        ;; regardless of the header-line face.
-        (while (string-match "[ \t]+" header pos)
+        ;; Turn whitespace chars in the header into stretch specs so
+        ;; they work regardless of the header-line face.
+        (while (string-match "[ \t\n]+" header pos)
           (setq pos (match-end 0))
           (put-text-property (match-beginning 0) pos 'display
                              ;; Assume fixed-size chars in the buffer.
@@ -726,6 +726,7 @@ For more information, see the function `buffer-menu'."
       (erase-buffer)
       (setq standard-output (current-buffer))
       (unless Buffer-menu-use-header-line
+        ;; Use U+2014 (EM DASH) to underline if possible, else U+002D (HYPHEN-MINUS)
         (let ((underline (if (char-displayable-p ?—) ?— ?-)))
           (insert header
                   (apply 'string