WK2 drag cancel inadvertently causes :hover styles to happen on an element not under mouse
* STEPS TO REPRODUCE
1. Open <http://html5demos.com/drag> in WebKit2 MiniBrowser window
2. Start a very small drag on "One" and drop on itself
=> "Three" will show its mouse hover state, even though we are not mousing over it.
- Doesn't happen with a WebKit1 window.
I can't reproduce this in Safari at the moment. Only MiniBrowser. Maybe this is a WKWebView issue?