Pass target and validated to ClientDnDGrabHandler::dropped()

Allows the compositor to focus the target window on successful drop.

anvil/src/state.rs

@@ -206,7 +206,7 @@ impl<BackendData: Backend> ClientDndGrabHandler for AnvilState<BackendData> {
         };
         self.dnd_icon = icon.map(|surface| DndIcon { surface, offset });
     }
-    fn dropped(&mut self, _seat: Seat<Self>) {
+    fn dropped(&mut self, _target: Option<WlSurface>, _validated: bool, _seat: Seat<Self>) {
         self.dnd_icon = None;
     }
 }

src/wayland/selection/data_device/dnd_grab.rs

@@ -263,7 +263,7 @@ where
             }
         }
 
-        ClientDndGrabHandler::dropped(data, self.seat.clone());
+        ClientDndGrabHandler::dropped(data, self.current_focus.clone(), validated, self.seat.clone());
         self.icon = None;
         // in all cases abandon the drop
         // no more buttons are pressed, release the grab

src/wayland/selection/data_device/mod.rs

@@ -140,8 +140,11 @@ pub trait ClientDndGrabHandler: SeatHandler + Sized {
     ///
     /// Note that this event will only be generated for client-initiated drag'n'drop session.
     ///
+    /// * `target` - The target surface that the contents were dropped on.
+    /// * `validated` - Whether the drop offer was negotiated and accepted. If `false`, the drop
+    ///                 was cancelled or otherwise not successful.
     /// * `seat` - The seat on which the DnD action was finished.
-    fn dropped(&mut self, seat: Seat<Self>) {}
+    fn dropped(&mut self, target: Option<WlSurface>, validated: bool, seat: Seat<Self>) {}
 }
 
 /// Event generated by the interactions of clients with a server initiated drag'n'drop