Comment by ardenpm

Spent half the morning trying to work out why drag and drop events were not working properly in code that was working fine and deployed for nearly a year. Finally tracked it down to this obscure bug in Chrome 77 which re-orders drag and drop events but only when your page is inside an iframe that is hosted on a different domain. Looking at the report it looks like this has broken a lot of peoples applications and likely a lot more that haven't yet worked out this is the reason. Looks like a fix is coming in 78 fortunately.