Allow renaming lambda parameters

[anthonyvdotbe]

When trying to rename a lambda parameter, a tooltip says Renaming this element is not supported.

Environment

• Operating System: Windows 10
• JDK version: 13
• Visual Studio Code version: 1.42.1
• Java extension version: 0.57.0

Steps To Reproduce

1. create a file Test.java as below
2. place the cursor at the lambda parameter i
3. press F2 to attempt renaming it

import java.util.function.Function;

class Test {

    Function<Integer, String> f = i -> "" + i;

}

Current Result

A tooltip says Renaming this element is not supported.

Expected Result

Renaming is supported

Additional Informations