Multiline string literal breaks java highlighting

[alexeyinkin]

For this input:

class MyClass {
  private string str = "abc";
}

we get the correct result:

Make this string literal multiline:

class MyClass {
  private string str = """
  abc
  """;
}

and nothing is parsed:

Note that language is also null although java is explicitly passed.

This codepen shows that the original highlightjs can handle multiline string literals: https://codepen.io/alexey-inkin/pen/abYYVOj

Code

```dart import 'package:highlight/highlight_core.dart'; import 'package:highlight/languages/java.dart'; void main() { highlight.registerLanguage('java', java); const text = ''' class MyClass { private string str = "abc"; } '''; final result = highlight.parse(text, language: 'java'); print(result.nodes); const textMultiline = ''' class MyClass { private string str = """ abc """; } '''; final resultMultiline = highlight.parse(textMultiline, language: 'java'); print(resultMultiline.nodes); } ```

Output

``` [Instance of 'Node', Instance of 'Node', Instance of 'Node', Instance of 'Node', Instance of 'Node', Instance of 'Node', Instance of 'Node'] [Instance of 'Node'] ```