fmt: fix formatting of struct field with default value and new attr syntax (stage 2) (#19683)

vlib/v/ast/ast.v

@@ -324,6 +324,7 @@ pub:
 	comments         []Comment
 	i                int
 	has_default_expr bool
+	attrs_has_at     bool // TODO: remove in next stage
 	attrs            []Attr
 	is_pub           bool
 	default_val      string

vlib/v/fmt/struct.v

@@ -145,7 +145,8 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl, is_anon bool) {
 		f.mark_types_import_as_used(field.typ)
 		attrs_len := inline_attrs_len(field.attrs)
 		has_attrs := field.attrs.len > 0
-		if has_attrs {
+		// TODO: this will get removed in next stage
+		if has_attrs && !field.attrs_has_at {
 			f.write(strings.repeat(` `, field_align.max_type_len - field_types[i].len))
 			f.single_line_attrs(field.attrs, same_line: true)
 		}
@@ -167,6 +168,10 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl, is_anon bool) {
 				inc_indent = false
 			}
 		}
+		if has_attrs && field.attrs_has_at {
+			// TODO: calculate correct padding
+			f.single_line_attrs(field.attrs, same_line: true)
+		}
 		// Handle comments after field type
 		if after_type_comments.len > 0 {
 			if after_type_comments[0].pos.line_nr > field.pos.line_nr {

vlib/v/parser/struct.v

@@ -295,7 +295,9 @@ fn (mut p Parser) struct_decl(is_anon bool) ast.StructDecl {
 					has_default_expr = true
 					comments << p.eat_comments()
 				}
+				mut has_at := false // TODO: remove in next stage
 				if p.tok.kind == .at {
+					has_at = true
 					p.inside_struct_attr_decl = true
 					// attrs are stored in `p.attrs`
 					p.attributes()
@@ -316,6 +318,7 @@ fn (mut p Parser) struct_decl(is_anon bool) ast.StructDecl {
 					i: i
 					default_expr: default_expr
 					has_default_expr: has_default_expr
+					attrs_has_at: has_at
 					attrs: p.attrs
 					is_pub: is_embed || is_field_pub
 					is_mut: is_embed || is_field_mut