src/vs/platform/undoRedo/common/undoRedoService.ts/UndoRedoService/getUriComparisonKey
class UndoRedoService:	public getUriComparisonKey(resource: URI): string {
		for (const uriComparisonKeyComputer of this._uriComparisonKeyComputers) {
			if (uriComparisonKeyComputer[0] === resource.scheme) {
				return uriComparisonKeyComputer[1].getComparisonKey(resource);
			}
		}
		return resource.toString();
	}