src/vs/platform/undoRedo/common/undoRedoService.ts/UndoRedoService/registerUriComparisonKeyComputer
class UndoRedoService:	public registerUriComparisonKeyComputer(scheme: string, uriComparisonKeyComputer: UriComparisonKeyComputer): IDisposable {
		this._uriComparisonKeyComputers.push([scheme, uriComparisonKeyComputer]);
		return {
			dispose: () => {
				for (let i = 0, len = this._uriComparisonKeyComputers.length; i < len; i++) {
					if (this._uriComparisonKeyComputers[i][1] === uriComparisonKeyComputer) {
						this._uriComparisonKeyComputers.splice(i, 1);
						return;
					}
				}
			}
		};
	}