ecrementSelectedRow st | (selectedRow st) > 0 =
  case (mode st) of
    MaildirMode ->
      let
        sr = (selectedRowMD . maildirState) st
        maildirState' = (maildirState st) { selectedRowMD = sr - 1 }
      in
       st { maildirState = maildirState' }
    IndexMode ->
      let
        sr = (selectedRowIn . indexState) st
        indexState' = (indexState st) { selectedRowIn = sr - 1 }
      in
       st { indexState = indexState' }
    _ -> st
                        | otherwise = st

decrementSelectedRow st | (selectedRow st) > 0 =
  case (mode st) of
    MaildirMode ->
      let
        sr = (selectedRowMD . maildirState) st
        maildirState' = (maildirState st) { selectedRowMD = sr - 1 }
      in
       st { maildirState = maildirState' }
    IndexMode ->
      let
        sr = (selectedRowIn . indexState) st
        indexState' = (indexState st) { selectedRowIn = sr - 1 }
      in
       st { indexState = indexState' }
    _ -> st
                        | otherwise = st
decrementSelectedRow st | (selectedRow st) > 0 =
  case (mode st) of
    MaildirMode ->
      let
        sr = (selectedRowMD . maildirState) st
        maildirState' = (maildirState st) { selectedRowMD = sr - 1 }
      in
       st { maildirState = maildirState' }
    IndexMode ->
      let
        sr = (selectedRowIn . indexState) st
        indexState' = (indexState st) { selectedRowIn = sr - 1 }
      in
       st { indexState = indexState' }
    _ -> st
                        | otherwise = st