Dealing with mouseup outside of window

[Abram Clark]

This is a classic problem with most JavaScript drag code. Easy to fix here, kind of surprised it's not already. On line 197 of drag.js I now have:

if(!event.which) // drag ended outside window

drag.hijack( event, "dragend", dd );

else

drag.hijack( event, "drag", dd );

Is there some gotcha I'm not thinking about? Why doesn't it already work like this? I'd like to make a pull request, but can't find this project in a public source control. Why isn't drag.js on Github?