`mime-preview-toggle-header' to C-c C-t h and C-c C-t C-f.
(define-key mime-view-mode-map
"\C-c\C-p" (function mime-preview-print-current-entity))
(define-key mime-view-mode-map
- "\C-c\C-t\C-h" (function mime-preview-toggle-header))
+ "\C-c\C-t\C-f" (function mime-preview-toggle-header))
+ (define-key mime-view-mode-map
+ "\C-c\C-th" (function mime-preview-toggle-header))
(define-key mime-view-mode-map
"\C-c\C-t\C-c" (function mime-preview-toggle-content))
(define-key mime-view-mode-map