Fix sxhash-equal on bytecodes, markers, etc.

Problem reported by Pip Cet (Bug#38912#14).
* doc/lispref/objects.texi (Equality Predicates):
Document better when ‘equal’ looks inside objects.
* doc/lispref/windows.texi (Window Configurations):
Don’t say that ‘equal’ looks inside window configurations.
* etc/NEWS: Mention the change.
* src/fns.c (internal_equal):
Do not look inside window configurations.
(sxhash_obj): Hash markers, byte-code function objects,
char-tables, and font objects consistently with Fequal.
* src/window.c (compare_window_configurations):
Now static.  Remove last argument.  Caller changed.
* test/lisp/ffap-tests.el (ffap-other-window--bug-25352):
Use compare-window-configurations, not ‘equal’.
* test/src/fns-tests.el (test-sxhash-equal): New test.

1 files changed, 1 insertions, 1 deletions

diff --git a/test/lisp/ffap-tests.el b/test/lisp/ffap-tests.el
index eaf39680e48..30c8f794577 100644
--- a/test/lisp/ffap-tests.el
+++ b/test/lisp/ffap-tests.el
@@ -74,7 +74,7 @@ left alone when opening a URL in an external browser."
              (urls nil)
              (ffap-url-fetcher (lambda (url) (push url urls) nil)))
     (should-not (ffap-other-window "https://www.gnu.org"))
-    (should (equal (current-window-configuration) old))
+    (should (compare-window-configurations (current-window-configuration) old))
     (should (equal urls '("https://www.gnu.org")))))
 
 (provide 'ffap-tests)