Correctly format nested pipeline operators

Closes #4151

crates/compiler/fmt/src/expr.rs

@@ -1382,9 +1382,9 @@ fn sub_expr_requests_parens(expr: &Expr<'_>) -> bool {
                     | BinOp::LessThanOrEq
                     | BinOp::GreaterThanOrEq
                     | BinOp::And
-                    | BinOp::Or => true,
-                    BinOp::Pizza
-                    | BinOp::Assignment
+                    | BinOp::Or
+                    | BinOp::Pizza => true,
+                    BinOp::Assignment
                     | BinOp::IsAliasType
                     | BinOp::IsOpaqueType
                     | BinOp::Backpassing => false,

crates/compiler/fmt/tests/test_fmt.rs

@@ -5582,6 +5582,21 @@ mod test_fmt {
         ));
     }
 
+    #[test]
+    fn format_nested_pipeline() {
+        expr_formats_same(indoc!(
+            r#"
+            (a |> b) |> c
+            "#
+        ));
+
+        expr_formats_same(indoc!(
+            r#"
+            a |> b |> c
+            "#
+        ));
+    }
+
     // this is a parse error atm
     //    #[test]
     //    fn multiline_apply() {