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(rmail-search-mime-message-function)
(rmail-search-mime-header-function): New variables.
(rmail-expunge-and-save): Be sure to set-buffer to the Rmail
buffer.
(rmail-quit): Bury `rmail-buffer' after `rmail-view-buffer' is
hidden.
(rmail-get-new-mail): Likewise.
(rmail-toggle-header): Likewise.  If rmail-enable-mime is non-nil,
call rmai-show-mime-function.
(rmail-display-labels): If rmail-enable-mime is non-nil, update
mode-line-process of rmail-view-buffer.
(rmail-set-attribute): Be sure to set-buffer to the Rmail buffer.
(rmail-show-message): Be sure to call rmail-auto-file in the Rmail
buffer.
(rmail-next-message): Be sure to set-buffer to the Rmail buffer.
(rmail-next-undeleted-message): Likewise.
(rmail-message-regexp-p): If rmail-enable-mime is non-nil, call
rmail-search-mime-header-function.
(rmail-search-message): New function.
(rmail-search): Call rmail-search-message to check if a message
matches REGEXP, lastly update point after calling
rmail-show-message.
(rmail-undelete-previous-message): Be sure to set-buffer to the
Rmail buffer.
(rmail-expunge-confirmed): Likewise.
(rmail-only-expunge): Likewise.
(rmail-reply): If rmail-enable-mime is non-nil, don't narrow to
header region, refer to rmail-msgref-vector while setting the
current buffer to rmail-buffer temporarily.
(rmail-forward): Be sure to bind forward-buffer to the Rmail
buffer.  If rmail-enable-mime is non-nil, call
rmail-insert-mime-forwarded-message-function instead of inserting
forwarded message by itself.