bug#50576: 28.0.50; display-buffer-in-previous-window no longer accepts window value for previous-window

[Juri Linkov]

> It seems the patch in this message:
>
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=45688#116
>
> which was installed causes the function
> display-buffer-in-previous-window to fail when called with an alist
> having the previous-window key set to a window value, because it calls
> boundp on the value unconditionally rather than checking the type of
> the value.

Sorry, this was a wrong assumption.  Does this patch correctly fix it?

diff --git a/lisp/window.el b/lisp/window.el
index 2960384e15..1c795cf684 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -8363,7 +8363,7 @@ display-buffer-in-previous-window
            (throw 'best t)))))
     ;; When ALIST has a `previous-window' entry, that entry may override
     ;; anything we found so far.
-    (when (and previous-window (boundp previous-window))
+    (when (and previous-window (symbolp previous-window) (boundp 
previous-window))
       (setq previous-window (symbol-value previous-window)))
     (when (and (setq window previous-window)
               (window-live-p window)