Fix draggable during mobile scrolling

[SebouChu]

On mobile devices or other touch screens, if you start interacting with an element used with jQuery-UI Draggable, the JS console throws errors like this :

Ignored attempt to cancel a touchmove event with cancelable=false, for example because scrolling is in progress and cannot be interrupted.

To fix it, we call event.preventDefault method in simulateMouseEvent only if the current event is cancelable.

[AAaNEIgeiDEItao]

If I have a long list of fixed heights, the sub-items in it need to be scrolled, but when I scroll with my finger, the drag event is missing, I set the "delay" property, but the scrolling still does not work

[RWAP]

It helps if you say whether this is on iOS, Android or another operating system. Is it a mobile phone or tablet?

Sample code uploaded somewhere for people to try also helps as most of the problems people now experience are down to errors in the DOM, or people actually using the original code rather than this version of the fork.

It is hard to know what is going on - I only have an Android phone - no other touch screen devices and debugging touch screen events is not easy!