Test/review references viewlet API

[jrieken]

Refs: #106929

• anyOS @alexdima
• anyOS @dbaeumer

Complexity: 4

Create Issue

---

The references viewlet has been reworked and now allows to show arbitrary contents via an extension API.

• Make yourself familiar with the references viewlet API: https://github.com/microsoft/vscode-references-view/blob/a44cd9a6b08f9570572287f0fdbb2bd0b8ad035b/src/references-view.d.ts
• Create a new dummy extensions and extends the "Hello World" command so that it shows some content in the references viewlet

[dbaeumer]

@jrieken I am a little bit puzzled. How to I talk to the reference viewlet. The API list only interfaces. So how I get to the instance ?

[jrieken]

Like so

const api = await vscode.extensions.getExtension<Api>('ms-vscode.references-view')?.activate();

[dbaeumer]

Thanks!