dragEnd sometimes not called

[mindade]

I'm using the dragStart/End functionality in an app. On iOS, I noticed that occasionally, the dragEnd is not called. I don't think it has anything to do with iOS, other than the performance being so good on an iPhone or iPad. It's not too difficult to reproduce. If you drag a node and then swipe and lift your finger, the dragEnd is not called. It might take a few tries to get it to trigger.

[cdjackson]

My guess is that this is likely to be an issue within the vis library itself, rather than in the angular directive. The directive just hooks the events directly from the vis library to the calling code.