Add required keyword fix to file

[FMorschel]

If you have the following code:

class A {
  const A(this.a, this.b, this.c, this.d, this.e, this.f);
  
  final int a;
  final int b;
  final int c;
  final int d;
  final int e;
  final int f;
}

When you wrap more than one, let's say all, of the positional parameters for the constructor into curly braces, you get a diagnostic of missing_default_value_for_parameter which has currently only one fix that is to add the required keyword to the selected parameter. There is no way for you to use that fix easily for the whole constructor/file.

My request is to make it possible to use the Add 'required' keyword to file-level fix.

There is no reason not to, if the user chooses that, it is easy to undo on the IDE.

[bwilkerson]

... which has currently only one fix ...

But there is more than one way to fix the problem, and that might have been

It's possible that not supporting fix-all-in-file was just an oversight, but it's also possible that we decided that because there's more than one way to fix the problem (even if some of them aren't automated) meant that users should look at each violation in order to determine the right action.

I'm not sure how valid that argument is in this case, but I do believe that it's generally something we should consider seriously.