gnus-art.el: Misc improvements for displaying MIME parts
* gnus-art.el (gnus-mm-display-part): Don't put article out of sight while prompting a user for a file name, etc. (gnus-mime-display-single): Display part with a common appearance no matter whether MIME button is omitted or not; don't add duplicate entry to gnus-article-mime-handle-alist. (gnus-mime-buttonize-attachments-in-header): Use copied buttons.
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