printer: fix printing of lists

printer/nodes.go

@@ -85,11 +85,13 @@ func (p *printer) list(l *ast.ListType) []byte {
 
 	for i, item := range l.List {
 		if item.Pos().Line != l.Lbrack.Line {
-			// not same line
+			// multiline list, add newline before we add each item
 			buf.WriteByte(newline)
-		}
-
+			// also indent each line
 			buf.Write(p.indent(p.output(item)))
+		} else {
+			buf.Write(p.output(item))
+		}
 
 		if i != len(l.List)-1 {
 			buf.WriteString(",")

printer/testdata/complexhcl.golden

@@ -3,6 +3,8 @@ variable "foo" {
 	description = "bar"
 }
 
+developer = ["fatih", "arslan"]
+
 provider "aws" {
 	access_key = "foo"
 	secret_key = "bar"

printer/testdata/complexhcl.input

@@ -4,6 +4,8 @@ variable "foo" {
     description =     "bar"
 }
 
+developer = [     "fatih",       "arslan"]
+
 provider "aws" {
                             access_key ="foo"
      secret_key =         "bar"