extensions/markdown-language-features/src/features/workspaceSymbolProvider.ts/MarkdownWorkspaceSymbolProvider/populateSymbolCache
class MarkdownWorkspaceSymbolProvider:	public async populateSymbolCache(): Promise<void> {
		const markdownDocumentUris = await this._workspaceMarkdownDocumentProvider.getAllMarkdownDocuments();
		for (const document of markdownDocumentUris) {
			this._symbolCache.set(document.uri.fsPath, this.getSymbols(document));
		}
	}