[Emacs-diffs] emacs-25 9576e88: Fix `gnus-union' so as to behave like `cl-union'

[Katsumi Yamaoka]

branch: emacs-25
commit 9576e885ef33d08b53d8296e262e09d9deda9523
Author: Katsumi Yamaoka <address@hidden>
Commit: Katsumi Yamaoka <address@hidden>

    Fix `gnus-union' so as to behave like `cl-union'
    
    * lisp/gnus/gnus-group.el (gnus-group-prepare-flat):
    Make gnus-union use `equal' to compare items in lists.
    
    * lisp/gnus/gnus-util.el (gnus-union):
    Make it behave like cl-union partially.
---
 lisp/gnus/gnus-group.el |    3 ++-
 lisp/gnus/gnus-util.el  |   19 +++++++++++++------
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/lisp/gnus/gnus-group.el b/lisp/gnus/gnus-group.el
index b1a4933..9f272f4 100644
--- a/lisp/gnus/gnus-group.el
+++ b/lisp/gnus/gnus-group.el
@@ -1396,7 +1396,8 @@ if it is a string, only list groups matching REGEXP."
       (gnus-group-prepare-flat-list-dead
        (gnus-union
        not-in-list
-       (setq gnus-killed-list (sort gnus-killed-list 'string<)))
+       (setq gnus-killed-list (sort gnus-killed-list 'string<))
+       :test 'equal)
        gnus-level-killed ?K regexp))
 
     (gnus-group-set-mode-line)
diff --git a/lisp/gnus/gnus-util.el b/lisp/gnus/gnus-util.el
index 40e2dcf..6759c07 100644
--- a/lisp/gnus/gnus-util.el
+++ b/lisp/gnus/gnus-util.el
@@ -1372,18 +1372,25 @@ Return the modified alist."
 
 (if (fboundp 'union)
     (defalias 'gnus-union 'union)
-  (defun gnus-union (l1 l2)
-    "Set union of lists L1 and L2."
+  (defun gnus-union (l1 l2 &rest keys)
+    "Set union of lists L1 and L2.
+If KEYS contains the `:test' and `equal' pair, use `equal' to compare
+items in lists, otherwise use `eq'."
     (cond ((null l1) l2)
          ((null l2) l1)
          ((equal l1 l2) l1)
          (t
           (or (>= (length l1) (length l2))
               (setq l1 (prog1 l2 (setq l2 l1))))
-          (while l2
-            (or (member (car l2) l1)
-                (push (car l2) l1))
-            (pop l2))
+          (if (eq 'equal (plist-get keys :test))
+              (while l2
+                (or (member (car l2) l1)
+                    (push (car l2) l1))
+                (pop l2))
+            (while l2
+              (or (memq (car l2) l1)
+                  (push (car l2) l1))
+              (pop l2)))
           l1))))
 
 (declare-function gnus-add-text-properties "gnus"