anchor.diff:        keyscheme:vi-normal
         (list
          "H"             'history-backwards
  -       "button8"       'history-backwards
  -       "button9"       'history-forwards
          "M-h"           'history-backwards-query
          "M-l"           'history-forwards-query
          "M-L"           'history-forwards-all-query
  
positive.code:     :documentation "Whether history navigation is restricted by buffer-local history.")
     (keyscheme-map
      (define-keyscheme-map "history" ()
        keyscheme:cua
        (list
         "M-left"        'history-backwards
         ;; this should be C-[
  
negative.code:       keyscheme:emacs
        (list
         "C-b"           'history-backwards
         "M-b"           'history-backwards-query
         "M-f"           'history-forwards-query
         "C-M-f"         'history-forwards-all-query
  