astprinter: PrintIndent applies indentation twice

[polarina]

Check out the following snippet: https://go.dev/play/p/FkEAZlnbd-E

The indentation is set to a single tab ("\t"), however, the printed output uses two tabs for indentation. Only one is expected.

---

package main

import (
	"fmt"
	"os"

	"github.com/wundergraph/graphql-go-tools/pkg/ast"
	"github.com/wundergraph/graphql-go-tools/pkg/astparser"
	"github.com/wundergraph/graphql-go-tools/pkg/astprinter"
	"github.com/wundergraph/graphql-go-tools/pkg/operationreport"
)

const graph = `
	{ foo bar(id: "123") }
`

func main() {
	parser := astparser.NewParser()
	doc := ast.NewDocument()
	doc.Input.ResetInputBytes([]byte(graph))

	report := operationreport.Report{}
	parser.Parse(doc, &report)

	if report.HasErrors() {
		fmt.Println(report.Error())
		return
	}

	if err := astprinter.PrintIndent(doc, doc, []byte("\t"), os.Stdout); err != nil {
		fmt.Println(err)
	}

	fmt.Println()
}

Output:

{
		foo
		bar(id: "123")
}