Merge imports with self and existing nested items gets rid of the latter

[DropDemBits]

rust-analyzer version: rust-analyzer version: ba33054 2022-02-07 stable

rustc version: rustc 1.58.1 (db9d1b20b 2022-01-20)

Initial code:

use nest::p::{self, B};
use nest::{
    p::{A, C},
    q,
};

pub mod nest {
    pub mod p {
        pub struct A;
        pub struct B;
        pub struct C;
    }

    pub mod q {}
}

Expected:

use nest::{
    p::{self, B, A, C},
    q,
};

Actual:

use nest::{
    p::{self, B},
    q,
};