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Part of #16 (closed), but I do not want to reopen it as that is 99 percent solved. In the following record data

defcm = { configuration = [CMMode "haskell", CMLineNumbers True]
        , position = (0,1)
        , selection = Nothing
        , highlighted = [((0,1),(0,3))]
        , source = ["buu", "muu"] }

the zeros are not showed in the editor when it initially rendered (there are just empty fields instead of the zeros)