Hi,
I would also like to come back on this super-old thread...
The problem is indeed fixed with the release 1.17, Safari, Chrome, Firefox, desktop or not, Mac or PC.
Except on IE, Windows 7 (even IE 9 to 11).
Because of IE, I still have to add some stopPropagation in the onClick handler, otherwise there is a 'ghost click' on native click events inside the Draggable, and when dragging from on top of such a native 'buttoned' element and then releasing the Draggable onto it, a native click happens...
And it seems sporadic, at least for the 'ghost click' effect.
(I cannot test on Windows 8 or 10 for the time being.)
Also, this.pointerEvent.stopPropagation() doesn’t really help, either on IE 9 (mouseup) or 10, 11 (pointers).
I actually have to generate a javascript error in the Draggable onClick handler for the Draggable to stop its click to propagate.