fmt: keep comment between enum fields (#7566)

vlib/v/ast/ast.v

@@ -760,11 +760,12 @@ pub mut:
 
 pub struct EnumField {
 pub:
-	name     string
+	name          string
-	pos      token.Position
+	pos           token.Position
-	comments []Comment
+	comments      []Comment
-	expr     Expr
+	next_comments []Comment
-	has_expr bool
+	expr          Expr
+	has_expr      bool
 }
 
 pub struct EnumDecl {

vlib/v/fmt/fmt.v

@@ -739,6 +739,7 @@ pub fn (mut f Fmt) enum_decl(node ast.EnumDecl) {
 		}
 		f.comments(field.comments, inline: true, has_nl: false, level: .indent)
 		f.writeln('')
+		f.comments(field.next_comments, inline: false, has_nl: true, level: .indent)
 	}
 	f.writeln('}\n')
 }

vlib/v/fmt/tests/comments_keep.vv

@@ -1,3 +1,11 @@
+enum Abc {
+	a
+	b // after a value
+	c
+	// between values
+	d
+}
+
 struct User {
 	name string // name
 	// middle comment

vlib/v/parser/parser.v

@@ -1965,7 +1965,8 @@ fn (mut p Parser) enum_decl() ast.EnumDecl {
 			pos: pos
 			expr: expr
 			has_expr: has_expr
-			comments: p.eat_comments()
+			comments: p.eat_line_end_comments()
+			next_comments: p.eat_comments()
 		}
 	}
 	p.top_level_statement_end()