fix(touch): Fix window scrolling while dragging on iDevices. Fixes #183

Also fixes react-grid-layout/react-grid-layout#338

Author: STRML

lib/DraggableCore.es6

@@ -253,6 +253,9 @@ export default class DraggableCore extends React.Component {
 
   handleDrag: EventHandler<MouseTouchEvent> = (e) => {
 
+    // Prevent scrolling on mobile devices, like ipad/iphone.
+    if (e.type === 'touchmove') e.preventDefault();
+
     // Get the current drag point from the event. This is used as the offset.
     const position = getControlPosition(e, this.state.touchIdentifier, this);
     if (position == null) return;