JavaScript syntax highlighting breaks when using '<' in arrow functions over multiple lines

[laeckerv]

• VSCode Version: 1.31.0 / Insiders 1.32
• OS Version: MacOS Mojave 10.14.3
• Does this issue occur when all extensions are disabled?: Yes

Initial bug found in

This doesn't work:

  isDraggingUpFromCenter = (startPosition, data) =>
    startPosition < this.halfOfWindowHeight() &&
    startPosition > this.halfOfWindowHeight() - AREAFORLISTENERCENTER &&
    data.deltaY < TRIGGERINGDELTAY;

while this works fine:

  isDraggingUpFromCenter = (startPosition, data) => {
    return(
        startPosition < this.halfOfWindowHeight() &&
        startPosition > this.halfOfWindowHeight() - AREAFORLISTENERCENTER &&
        data.deltaY < TRIGGERINGDELTAY;
    )
  }

Simple standalone code to test with

const FOO = 0;
const FOOO = 0;

class Bar {
  myFunc1 = () =>
    1 < 2 &&
    2 > 1 &&
    FOO < FOOO;
  myFunc2 = () =>
    1 < 2 &&
    2 > 1 &&
    FOO < FOOO;
}

export default Bar

Rsults in

With this example (because i reduced the conditions) I also found out that when format it differently - it also works.

const FOO = 0;
const FOOO = 0;

class Bar {
  myFunc1 = () => 1 < 2 && 2 > 1 && FOO < FOOO;
  myFunc2 = () => 1 < 2 && 2 > 1 && FOO < FOOO;
}

export default Bar

Results in

[mjbvz]

Looks like #718. I just pulled in the latest grammar form master to VS Code to test this but it still seems broken