populate_unroll_column(Surface[Cursor_pane.col], pane.id, rel)

    populate_unroll_column(Surface[Cursor_pane.col], pane.id, rel)  -- invalidates new_pane

    add_title(new_pane, ('%d/%d'):format(Cursor_pane.row, Cursor_pane.row))
    new_pane.editable = true
    Surface[Cursor_pane.col][Cursor_pane.row] = new_pane

    Surface[Cursor_pane.col][Cursor_pane.row].editable = true