Fix `gnus-union' so as to behave like `cl-union'

[gnus] / lisp / ChangeLog

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+2015-12-23  Katsumi Yamaoka  <yamaoka@jpl.org>
+
+       Fix `gnus-union' so as to behave like `cl-union'.
+
+       * gnus-group.el (gnus-group-prepare-flat):
+       Make gnus-union use `equal' to compare items in lists.
+
+       * gnus-util.el (gnus-union): Make it behave like cl-union partially.
+
 2015-12-17  Eli Zaretskii  <eliz@gnu.org>
 
        * auth-source.el (auth-source-ensure-strings):