Add conditional operator xor to subr.el

Suggested by Oleh Krehel and implemented by Basil Contovounesios in
the following thread:
https://lists.gnu.org/archive/html/emacs-devel/2019-07/msg00547.html

* lisp/array.el (xor): Move unused function from here...
* lisp/subr.el: ...to here, and improve.
* lisp/gnus/spam.el (spam-xor):
* lisp/play/5x5.el (5x5-xor):
* lisp/proced.el (proced-xor):
* lisp/progmodes/idlwave.el (idlwave-xor):
* lisp/vc/diff-mode.el (diff-xor): Define as obsolete aliases of,
and replace all uses with, xor.
* lisp/jsonrpc.el: Remove unused dependency on array.el.
* lisp/org/org.el (org-xor): Move from here...
* lisp/org/org-compat.el (org-xor): ...to here, as a compatibility
shim for xor.
* lisp/progmodes/idlw-shell.el (idlwave-shell-enable-all-bp):
* lisp/simple.el (exchange-point-and-mark):
* lisp/windmove.el (windmove-display-in-direction): Use xor.
* lisp/strokes.el (strokes-xor): Remove commented-out xor
implementation.

* doc/lispref/control.texi (Control Structures): Extend menu entry
for new combining condition.
(Combining Conditions):
* etc/NEWS (Lisp Changes): Document xor.

* test/lisp/subr-tests.el (subr-test-xor): New test.

1 files changed, 0 insertions, 5 deletions

diff --git a/lisp/array.el b/lisp/array.el
index 2fffe0197e8..965e97ff553 100644
--- a/lisp/array.el
+++ b/lisp/array.el
@@ -740,11 +740,6 @@ of `array-rows-numbered'."
         ((> index limit) limit)
         (t index)))
 
-(defun xor (pred1 pred2)
-  "Return the logical exclusive or of predicates PRED1 and PRED2."
-  (and (or pred1 pred2)
-       (not (and pred1 pred2))))
-
 (defun current-line ()
   "Return the current buffer line at point.  The first line is 0."
   (count-lines (point-min) (line-beginning-position)))