Allow using a Function as the cancel option instead of a Selector.

[kghandi]

This is particularly useful when using Sortable on nested lists.
I had a similar issue to that listed in issue 1996. Allowing cancel option to be a function allows me to override the default cancel implementation using a selector with something like:

$('.container', context).sortable({
items: '>.widget',
cancel: function (event) {
return $(event.target).closest('.widget').is('.locked');
}
});

[linux-foundation-easycla]

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