0dfdc9371e
During a drag-and-drop, our pointer grab keeps enter/leave events from being delivered. That means that after the DND ends, whatever actor is under the pointer won't have received the enter event it should have, and any state or hover effect dependent on that won't work right. By remembering the first-leave and last-enter events we can figure out what widgets we need to call st_widget_sync_hover() on after the drag. https://bugzilla.gnome.org/show_bug.cgi?id=640974
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