when writing bullet lists, the first use of shoud move the cursor to the next tabstop and then the next use would decrease the bullet level.

say, for example, I have (| represents the cursor)

- |

after first tab, I want

-   |

and after next tab

    +   |

the current behavior is
say, for example, I have (| represents the cursor)

- |

after first tab, I have

    + |