The drag doesn't really happen in the end, but we shouldn't change the cursor to the accept one.
Created attachment 406379 [details] Patch
Thanks for the patch. If this patch contains new public API please make sure it follows the guidelines for new WebKit2 GTK+ API. See http://trac.webkit.org/wiki/WebKitGTK/AddingNewWebKit2API
Committed r265649: <https://trac.webkit.org/changeset/265649>