Make eldoc-echo-area-prefer-doc-buffer consider all frames

Previously, it considered only windows on 'visible' frames (according
to get-buffer-window).  This seemed correct at first, but it's not
much use for multiple TTY frames and not particularly reliable on GUI
frames either.  There's no reliable way to tell what is actually
visible, so it's best to assume that users setup frames that are
indeed visible when using this parameter.

* lisp/emacs-lisp/eldoc.el (eldoc--echo-area-prefer-doc-buffer-p):
Consider all frames.

diff --git a/lisp/emacs-lisp/eldoc.el b/lisp/emacs-lisp/eldoc.el
index 724453d766138fbf5326fd4c8d562df565666c3a..e5f055d03210729357ff5cf9e8bcf635499d67a2 100644 (file)
--- a/lisp/emacs-lisp/eldoc.el
+++ b/lisp/emacs-lisp/eldoc.el
@@ -551,12 +551,13 @@ Helper for `eldoc-display-in-echo-area'."
 (defun eldoc--echo-area-prefer-doc-buffer-p (truncatedp)
   "Tell if display in the echo area should be skipped.
 Helper for `eldoc-display-in-echo-area'.  If TRUNCATEDP the
-documentation to potentially appear in the echo are is truncated."
+documentation to potentially appear in the echo area is
+known to be truncated."
   (and (or (eq eldoc-echo-area-prefer-doc-buffer t)
            (and truncatedp
                 (eq eldoc-echo-area-prefer-doc-buffer
                     'maybe)))
-       (get-buffer-window eldoc--doc-buffer 'visible)))
+       (get-buffer-window eldoc--doc-buffer t)))
 
 (defun eldoc-display-in-echo-area (docs _interactive)
   "Display DOCS in echo area.