Gnus: Make gnus-mime-inline-part and gnus-mime-inline-part work similarly
* gnus-art.el (gnus-mime-inline-part): Redisplay a button so as to show the displaying state of a part. (gnus-mime-inline-part): Don't insert a newline in the beginning of a part like gnus-mime-inline-part doesn't; work for XEmacs. * mm-decode.el (mm-display-part): Don't insert a newline in the top. (mm-shr): Make undisplayer unbreakable. * mm-view.el (mm-inline-image-emacs, mm-inline-image-xemacs): Don't insert excessive newline. (mm-inline-text-html-render-with-w3m, mm-inline-text) (mm-insert-inline): Make undisplayer unbreakable.
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