message: Copy href to clipboard instead of directly opening
diff: @@ -260,7 +260,8 @@ export class Viewer implements IViewer {
  break
  }
  case 'external_link': {
  - void vscode.env.openExternal(vscode.Uri.parse(data.url))
  + void vscode.env.clipboard.writeText(data.url)
  + void vscode.window.showWarningMessage(`The link ${data.url} has been copied to clipboard.`, 'OK')
  break
  }
  case 'ping': {
  