* gnus-art.el (article-decode-mime-words, article-babel)

* gnus-art.el (article-decode-mime-words, article-babel)
(gnus-article-highlight-signature, gnus-article-add-buttons)
(gnus-signature-toggle): Use gnus-with-article-buffer.

* gnus-art.el (gnus-article-highlight-headers)
(gnus-article-add-buttons-to-head): Use gnus-with-article-headers.

* gnus-art.el (gnus-mm-display-part, gnus-article-wash-status)
(gnus-article-set-globals, gnus-request-article-this-buffer)
(gnus-button-message-id, gnus-article-maybe-hide-headers)
(gnus-mime-view-part-externally, gnus-mime-view-part-internally)
(gnus-mime-display-alternative): Use with-current-buffer.