* mime-view.el (mime-view-xemacs-popup-menu): Abolish.

* mime-view.el (mime-view-xemacs-popup-menu): Abolish.
(mime-view-menu-title): Abolish.
(mime-view-menu-list): Rewrite in easymenu-style.
(mime-view-popup-menu): New function.
(mime-view-define-keymap): Simplify; don't check `emacs-major-version'.

* semi-def.el (mime-menu-bogus-filter-constructor): New macro.
(mime-menu-popup): New macro.
(select-menu-alist): Rewrite with `defun-maybe-cond'.
(mime-insert-button): Use `widget-convert-button'.
(mime-url-link): New widget.