Found while working on Issue #75.

Select at least two rows of cells and copy paste -- the inner html of the cell-value element contains pending '\r' that was inserted by our custom copy logic here:

    const value = R.slice(
        R.head(selectedRows) as any,
        R.last(selectedRows) as any + 1,
        dataframe
    ).map(row =>
        R.props(selectedCols, R.props(R.pluck('id', columns) as any, row) as any)
    ).map(row => R.values(row).join('\t')
    ).join('\r\n');

SheetClip provides a stringify function along with the parse function, we should use that instead of our custom logic.