iOS - dragging slider handle also scrolls screen

This is similar to #258 but the solution there (adding touch-action: none) doesn't work because iOS doesn't support it - see https://caniuse.com/#feat=css-touch-action

Safari uses passive document touch listeners by default as of iOS 11:
https://developer.apple.com/library/archive/releasenotes/General/WhatsNewInSafari/Articles/Safari_11_1.html

In createSlider.jsx changing:

    addDocumentTouchEvents() {
      // just work for Chrome iOS Safari and Android Browser
      this.onTouchMoveListener = addEventListener('touchmove', this.onTouchMove);
      this.onTouchUpListener = addEventListener(this.document, 'touchend', this.onEnd);
    }

...to...

    addDocumentTouchEvents() {
      // just work for Chrome iOS Safari and Android Browser
      this.onTouchMoveListener = this.document.addEventListener('touchmove', this.onTouchMove, {passive: false});
      this.onTouchUpListener = addEventListener(this.document, 'touchend', this.onEnd);
    }

...appears to work. I'm not sure whether it's worth registering the listener against a narrower area of the DOM though (as opposed to the whole document)?

this solution likely breaks IE support, though:
https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener
...so you'd have to add some browser detection around it.

Start in createSlider.jsx at addDocumentTouchEvents and inspect the existing addEventListener helper. Reproduce slider dragging on iOS Safari, then check the listener behavior against the documented browser compatibility concerns, including IE. Done means dragging the handle no longer scrolls the screen without regressing supported browsers.