[BUG] Code sections isn't working for Javascript language

[Taylor Hoffmann]

I tested with Java, Dart, and Javascript. Javascript was the only one of those languages where the sections didn't work.

I was trying to make the code read-only with controller.readOnlySectionNames = {'section1'};.

Dart example:

final controller = CodeController(
    text: '''
          // [START section1]
          final String test = "testing here";
          // [END section1]
          ''',
    language: dart,
    namedSectionParser: const BracketsStartEndNamedSectionParser(),
  );

Result:

---

Javascript example:

final controller = CodeController(
    text: '''
          // [START section1]
          console.log("teste");
          // [END section1]
          ''',
    language: javascript,
    namedSectionParser: const BracketsStartEndNamedSectionParser(),
  );

Result: