Extract variable should include type when always_include_types lint is enabled

[h-unterp]

Is your feature request related to a problem? Please describe.
I prefer to avoid var whenever possible. When I use the extract local variable feature, it only extracts it as var:

text.split(" ")

becomes

var text2 = text.split(" ")

Describe the solution you'd like
Use the types, if provided. So:

List<String> text2 = text.split(" ")

[DanTup]

@h-unterp is there a reason you closed this? It seems like a reasonable request to me, and could probably be triggered by the always_specify_types lint being enabled?

[h-unterp]

I closed because I found a solution to my issue.

I did not realize that you first need to

1. extract local variable
2. Then you get "Add type annotation"
   

While I do agree it would be convenient to have the add type annotation option available on the first click. I did not want to be a burden now that I have a solution.

[DanTup]

Ah, gotcha. I think it may still be reasonable to expect the server to automatically include these when the always_specify_types lint is enabled (to avoid it generating code that immediately violates the lint), so I'll re-open this as a request for that.

[DanTup]

Fixed by dart-lang/sdk@df3df89.

The fix is in the Dart language server so will ship with a future Dart/Flutter SDK update (not a VS Code extension update).