x/tools/cmd/goimports: should not propose imports that are shadowed by vendored copies

[timakin]

When you format import sections, goimports help us out of kindness.
However, it mistakenly mix GOPATH-depended packages with packages under the vendor directory.

I expect it should exclude GOPATH-depended one from an import section. if I use any vendoring tool.

(It maybe the role of golint, so if you mind, cound you point out?)

[timakin]

$ tree $GOPATH
$GOPATH
└── src
    ├── foo
    │   ├── main.go
    │   └── vendor
    │       └── bar
    │           └── bar.go
    ├── bar
    │   └── bar.go
    └── baz
        └── baz.go

# foo/main.go
package main

import (
	"bar"
	"baz" # Should exclude this line cuz it couldn't be found under the `vendor` path.
)

func main() {
	baz.Baz(&bar.Bar{N: 100, S: "bar"})
}

[heschi]

This seems like a real bug that could be fixed, but won't be an issue in module mode.

[vasilevp]

There can still be vendor in module mode though

[rulisastra]

has this been resolved?