Multiple prefix() sections should not be automatically sorted

[SOF3]

What version of GCI are you using?

0.13.4

Reproduce Steps

$ example.go
package example

import (
        _ "example.com/a/b"
        _ "example.com/i/j"
        _ "example.com/m/n"
        _ "example.com/p/q"
)

$ go run github.com/daixiang0/gci@v0.13.4 print example.go \
>       -s standard
>       -s default
>       -s 'prefix(example.com/i/j,example.com/m/n)'
>       -s 'prefix(example.com/a/b,example.com/p/q)'
package example

import (
        _ "example.com/a/b"
        _ "example.com/p/q"

        _ "example.com/i/j"
        _ "example.com/m/n"
)

What did you expect to see?

The sections should be consistent with the order of -ss passed.

What did you see instead?

The sections follow lexicographical order of the prefix() string. If I change the fourth section to prefix(example.com/p/q,example.com/a/b), the two sections in the output will be swapped.

[SOF3]

Possible workaround for now: add nosuchmodule/1, and nosuchmodule/2, after prefix( to force the order of prefixes.

[daixiang0]

The two prefix section does not follow lexicographical order which is written in the README, the strings in the prefix follow, so you can put then into one prefix section.

I think it is good to improve, you can take it if interested.

Label it as help wanted if someone else interested.

[SOF3]

I don't understand. What is written in the readme? And what does "you can put them into one prefix section" mean? I am referring to multiple prefix sections, not multiple prefixes within the same section; the , part is just for illustration.