There's a question on SO about splitting hunks using magit, and the two solutions given are to either stage the region (mark a region, hit stage), or to shrink/grow all hunks using `+` & `-`. That's not what I'm after.

In magit's status buffer, I want to split a hunk into two hunks, at the point, or at least at the lines around the point.

Turning this (excuse my bad diff formatting)

    @@ blah blah blah
    - foo
    + bar
    + baz
    +

Into

    @@ blah blah
    - foo
    + bar
    
    @ blah blah
    + baz

When the point is on bar.

Motivations:  

 - `baz` being a debug statement, so I'd like to drop it from the commit of `foo` & `bar` without getting rid of it. 

 - `bar` and `baz` being only partially related, meaning that their changes should not be in the same commit.

 - `bar` is large and `baz` is small, making it a lot easier to split the hunk rather than select `bar`

 - Similar to the last point, say a 20 line commit contains a single line the middle that should not be staged. It'd be easier to split & stage the top and bottom two hunks ignoring the middle one than use the region.

 - The above can arise sometimes when the diff presentation will separate the before and after of something that's been modified, and have something unhelpful in the middle. e.g.

<!-- -->

    @@ line
    - old_foo
    + random stuff
    + new foo