src/vs/workbench/contrib/files/common/explorerFileNestingTrie.ts/PreTrie/get
class PreTrie:	get(key: string, attributes: FilenameAttributes): string[] {
		const results: string[] = [];
		results.push(...this.value.get(key, attributes));

		const head = key[0];
		const rest = key.slice(1);
		const existing = this.map.get(head);
		if (existing) {
			results.push(...existing.get(rest, attributes));
		}

		return results;
	}