extensions/markdown-language-features/src/languageFeatures/pathCompletions.ts/MdPathCompletionProvider/register
class MdPathCompletionProvider:	public static register(
		selector: vscode.DocumentSelector,
		engine: MarkdownEngine,
		linkProvider: MdLinkProvider,
	): vscode.Disposable {
		return vscode.languages.registerCompletionItemProvider(selector, new MdPathCompletionProvider(engine, linkProvider), '.', '/', '#');
	}