Harden named arguments if a hard split occurs in the positional ones.

test/regression/189.stmt

+>>> (indent 2)
+  nestedSelect(currency, amount) => Intl.select(currency,
+      {
+        "CDN" : """${Intl.plural(amount, one: '$amount Canadian dollar',
+            other: '$amount Canadian dollars')}""",
+        "other" : "Whatever",
+      },
+     name: "nestedSelect",
+     args: [currency, amount]);
+<<<
+  nestedSelect(currency, amount) => Intl.select(
+      currency,
+      {
+        "CDN": """${Intl.plural(amount, one: '$amount Canadian dollar',
+            other: '$amount Canadian dollars')}""",
+        "other": "Whatever",
+      },
+      name: "nestedSelect",
+      args: [currency, amount]);
+>>> (indent 2)
+  expect(
+      Bidi.estimateDirectionOfText('CAPTCHA \u05de\u05e9\u05d5\u05db\u05dc\u05dc '
+          '\u05de\u05d3\u05d9?').value,
+      equals(TextDirection.RTL.value));
+<<<
+  expect(
+      Bidi
+          .estimateDirectionOfText(
+              'CAPTCHA \u05de\u05e9\u05d5\u05db\u05dc\u05dc '
+              '\u05de\u05d3\u05d9?')
+          .value,
+      equals(TextDirection.RTL.value));