Vscode: [html] provide rename for embedded JavaScript

[abdonrd]

• VSCode Version: v1.14.1
• OS Version: macOS Sierra v10.12.6
• Reproduces without extensions: Yes

Steps to Reproduce:

1. Create these two files:

my-custom-element.js

class MyCustomElement extends HTMLElement {
  static get is() {
    return 'my-custom-element';
  }
}

customElements.define(MyCustomElement.is, MyCustomElement);

my-custom-element.html

<script>
  class MyCustomElement extends HTMLElement {
    static get is() {
      return 'my-custom-element';
    }
  }

  customElements.define(MyCustomElement.is, MyCustomElement);
</script>

1. Try the Rename Refactoring with F2 in both files:

With the same code, the "Rename Refactoring" doesn't work in HTML language.

[aeschli]

Rename is currently not provided inside embedded JavaScript. But you can use 'Change occurrences'

[jorgecasar]

It could be great to have the same behavior inside script tags than we have in JS files. Like this one @abdonrd days and jsdocs comments per example.