Cell formatting stops working when class instance fields are present

[RLesser]

Describe the bug When a cell contains a class, and that class contains private class features, formatting seems to stop working.

To Reproduce Steps to reproduce the behavior:

1. Create a cell
2. Create a class in the cell with a line that should get formatted, and also has a private class feature:

class Test {
  #foo = 1;
  constructor() {
    const veryLongVariableNameRepresenting1 = 1;
    const veryLongVariableNameRepresenting2 = 2;
    // intially written as a single line
    const veryLongVariableNameRepresenting3 = veryLongVariableNameRepresenting1 + veryLongVariableNameRepresenting2;
  }
}

3. Saving the cell results. The line will not be reformatted.

Expected behavior The last line should be reformatted into two lines.

Desktop (please complete the following information):

• OS: macOS
• Browser: Chrome
• Version: 101

[CobusT]

I think this is happening with any instance field, right? Does it work if you have:

class Test {
  foo = 1;
  constructor() {
    const veryLongVariableNameRepresenting1 = 1;
    const veryLongVariableNameRepresenting2 = 2;
    // intially written as a single line
    const veryLongVariableNameRepresenting3 = veryLongVariableNameRepresenting1 + veryLongVariableNameRepresenting2;
  }
}

[RLesser]

Yep, happening with any instance field, not just private. Good catch!