Convert to switch expression removes `when`

[gabrielgarciagava]

When using the "convert to switch expression", the "when" parts are removed, which is very error prone (if you have a default case, you may miss it is gone)

Example:

int foo(int a, bool x) {
  switch (a) {
    case 1 when x:
      return 1;
    default:
      return 3;
  }
}

becomes

int foo(int a, bool x) {
  return switch (a) {
    1 => 1,
    _ => 3
  };
}

Tested with both Dart 3.8.1 (flutter stable) and 3.9.0-241.0.dev

[FMorschel]

I'll take a look at this. Thanks for the report!

FYI: You can add dart after the opening backsticks and it will use a basic language highlight.

[FMorschel]

Here is the CL https://dart-review.googlesource.com/c/sdk/+/435921