Method maybeSetState

src/react-list.js:153–157

(b, cb)

  }

  maybeSetState(b, cb) {
    if (isEqualSubset(this.state, b)) return cb();

    this.setState(b, cb);
  }

  componentWillUnmount() {
    window.removeEventListener('resize', this.updateFrameAndClearCache);