[graphiql] Incorrect block string highlighting

[mjy9088]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

Syntax highlighting is broken

Expected Behavior

Syntax highliighting should be fine

Steps To Reproduce

1. go to graphiql live demo
   • ... or, open vscode/graphiql/... etc.
2. paste query below

# This is syntactically valid query
query {
  person(id: """This \"""
is escaped triple dquotes""") {
    __typename
  }
}

Environment

(I couldn't find the environment info of the graphiql live demo

Anything else?

I've tried fix vscode syntax highlighting by editing corresponding(maybe?) source code on ~/.vscode/extensions/graphql.vscode-graphql-syntax-1.3.8/grammars/graphql.json, but failed