[gtk4] Drop target highlight remains visible on Xorg
Found at console#363 (moved).
When I drag and drop a file from Files to Console, the blue highlight that shows the drop target remains visible after I dropped the file into the console. It happens only on Xorg. On Wayland it works as expected, and the blue highlight disappears.
gtk4-based g-t is also affected (although it's a blue 1px outline for me, rather than an entire blue background).
MR for kgx over there, I think we need to do something like that, too.