fmt: prevent possible trailing whitespace in wrapped infixes (#9573)

vlib/v/fmt/fmt.v

@@ -1928,19 +1928,24 @@ pub fn (mut f Fmt) wrap_infix(start_pos int, start_len int, ignore_paren bool) {
 	for i, c in conditions {
 		cnd := c.trim_space()
 		if f.line_len + cnd.len < fmt.max_len[penalties[i]] {
-			if (i > 0 && i < conditions.len) || (ignore_paren && i == 0 && cnd[3] == `(`) {
+			if (i > 0 && i < conditions.len)
+				|| (ignore_paren && i == 0 && cnd.len > 5 && cnd[3] == `(`) {
 				f.write(' ')
 			}
 			f.write(cnd)
 		} else {
+			is_paren_expr := (cnd[0] == `(` || (cnd.len > 5 && cnd[3] == `(`)) && cnd.ends_with(')')
+			final_len := ((f.indent + 1) * 4) + cnd.len
 			prev_len := f.line_len
 			prev_pos := f.out.len
+			if i == 0 && !is_paren_expr {
+				f.remove_new_line({})
+			}
 			f.writeln('')
 			f.indent++
 			f.write(cnd)
 			f.indent--
-			if f.line_len > fmt.max_len.last() && (cnd[0] == `(` || cnd[3] == `(`)
-				&& cnd.ends_with(')') {
+			if final_len > fmt.max_len.last() && is_paren_expr {
 				f.wrap_infix(prev_pos, prev_len, true)
 			}
 		}

vlib/v/fmt/tests/infix_expr_expected.vv

@@ -14,3 +14,9 @@ fn unwrap_grouped_conds() {
 	fields = fields.filter((it.typ in [string_type, int_type, bool_type]
 		|| c.table.types[int(it.typ)].kind == .struct_) && !it.attrs.contains('skip'))
 }
+
+fn main() {
+	clean_struct_v_type_name =
+		clean_struct_v_type_name.replace('_Array', '_array').replace('_T_', '<').replace('_', ', ') +
+		'>'
+}

vlib/v/fmt/tests/infix_expr_input.vv

@@ -9,3 +9,7 @@ fn unwrap_grouped_conds() {
 	_ := (also_inside_parens || just_as_above || but_this_is_also_more || than_a_single_line_could_fit) && end_cond
 	fields = fields.filter((it.typ in [string_type, int_type, bool_type] || c.table.types[int(it.typ)].kind == .struct_) && !it.attrs.contains('skip'))
 }
+
+fn main() {
+	clean_struct_v_type_name = clean_struct_v_type_name.replace('_Array', '_array').replace('_T_', '<').replace('_', ', ') + '>'
+}

vlib/v/fmt/tests/infix_expr_keep.vv

@@ -0,0 +1,4 @@
+fn infix_in_multi_assign() {
+	child_width, child_height = child.adj_width + child.margin(.left) + child.margin(.right),
+		child.adj_height + child.margin(.top) + child.margin(.bottom)
+}