extensions/markdown-language-features/src/features/preview.ts/MarkdownPreview/iconPath
class MarkdownPreview:	private get iconPath() {
		const root = vscode.Uri.joinPath(this._contributionProvider.extensionUri, 'media');
		return {
			light: vscode.Uri.joinPath(root, 'preview-light.svg'),
			dark: vscode.Uri.joinPath(root, 'preview-dark.svg'),
		};
	}