vfmt: keep JS object name (#7462)

vlib/v/ast/str.v

@@ -43,11 +43,13 @@ pub fn (node &FnDecl) stringify(t &table.Table, cur_mod string) string {
 		receiver = '($node.receiver.name $m$name) '
 		*/
 	}
-	mut name := if node.is_anon { '' } else { node.name.after('.') }
-	if node.language == .c {
-		name = 'C.$name'
-	} else if node.language == .js {
-		name = 'JS.$name'
+	mut name := if node.is_anon { '' } else { node.name.after_char(`.`) }
+	if !node.is_method {
+		if node.language == .c {
+			name = 'C.$name'
+		} else if node.language == .js {
+			name = 'JS.$name'
+		}
 	}
 	f.write('fn $receiver$name')
 	if name in ['+', '-', '*', '/', '%'] {

vlib/v/fmt/fmt.v

@@ -1502,6 +1502,8 @@ pub fn (mut f Fmt) call_expr(node ast.CallExpr) {
 		f.write_language_prefix(node.language)
 		if node.left is ast.AnonFn {
 			f.fn_decl(node.left.decl)
+		} else if node.language != .v {
+			f.write('${node.name.after_char(`.`)}')
 		} else {
 			mut name := f.short_module(node.name)
 			f.mark_module_as_used(name)

vlib/v/fmt/tests/fn_js_object_keep.vv

@@ -0,0 +1,7 @@
+fn (v JS.String) toString() JS.String
+
+fn JS.Math.abs(f64) f64
+
+fn main() {
+	JS.Math.abs(0)
+}