Fill match arms deletes _ case

[tspiteri]

With this

enum E { A, B, C }
// ...
match e {
    E::A => 1,
    _ => 2,
}

If I use "Fill match arms" I get

match e {
    E::A => 1,
    
    E::B => {}
    E::C => {}
}

I did not expect the code action to delete my code (only 2 here, but it could be longer). I expected one of these (in order of preference):

1. E::B | E::C => 2,
2. E::B => 2,\n E::C => 2, or E::B => { 2 }\n E::C => { 2 } with the disadvantage being code duplication, especially if there is a long expression instead of just 2.
3. _ => 2 remains above the two added cases so that it can be removed after I fill them in. The disadvantage here is that it is easy to forget to remove it later, so maybe this is not a very good option, but at least it doesn't delete the code.