cue fix transforms multiple list + into deeply nested Concat

[nyarly]

What version of CUE are you using (cue version)?

$ cue version
cue version v0.11.0-alpha.3

go version go1.22.5
      -buildmode exe
       -compiler gc
       -trimpath true
     CGO_ENABLED 0
          GOARCH amd64
            GOOS linux
         GOAMD64 v1
cue.lang.version v0.11.0

Does this issue reproduce with the latest stable release?

List addition is only disallowed in 0.11 afaik

What did you do?

// pre 0.11
l: ["a"] + ["b"] + ["c"] + ["d"]

cue fix

import 'list'
l: list.Concat([list.Concat([list.Concat([["a"], ["b"]]), ["c"]), ["d"]])

At top levels and in complex configurations, this is impossible to read or reason about clear enough to repair.

What did you expect to see?

import "list"
l: list.Concat([["a"], ["b"], ["c"], ["d"]])