"Ready to receive" notification when dropping file onto Boxes guest interferes with itself
To reproduce: drag a file over the centre of a Boxes guest supporting file drag/drop.
The notification appears in the centre of the guest window, and immediately interferes with the guest being a drop target, causing the notification to disappear. At which point the guest then becomes a drop target again, showing the notification...
The result is the notification appears/disappears rapidly when the file is held over the centre of the guest window where it appears.
Tested with Boxes 3.36.2 and a GNOME 3.36.x guest (Fedora 32).