Update smithay, with cursor/selection changes

We'll probably want to add support for `cursor-shape-v1`. Not sure about
`wlr-data-control-unstable-v1`. But this just updates to work with the
latest smithay commit for new.

src/wayland/handlers/selection.rs

@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
+use crate::state::State;
+use smithay::{
+    input::Seat,
+    wayland::selection::{SelectionHandler, SelectionSource, SelectionTarget},
+    xwayland::xwm::XwmId,
+};
+use std::os::unix::io::OwnedFd;
+use tracing::warn;
+
+impl SelectionHandler for State {
+    type SelectionUserData = XwmId;
+
+    fn new_selection(
+        &mut self,
+        target: SelectionTarget,
+        source: Option<SelectionSource>,
+        _seat: Seat<State>,
+    ) {
+        if let Some(xwm) = self
+            .common
+            .xwayland_state
+            .as_mut()
+            .and_then(|xstate| xstate.xwm.as_mut())
+        {
+            if let Some(source) = &source {
+                if let Err(err) = xwm.new_selection(target, Some(source.mime_types())) {
+                    warn!(?err, "Failed to set Xwayland clipboard selection.");
+                }
+            } else if let Err(err) = xwm.new_selection(target, None) {
+                warn!(?err, "Failed to clear Xwayland selection.");
+            }
+        }
+    }
+
+    fn send_selection(
+        &mut self,
+        target: SelectionTarget,
+        mime_type: String,
+        fd: OwnedFd,
+        _seat: Seat<State>,
+        _user_data: &Self::SelectionUserData,
+    ) {
+        if let Some(xwm) = self
+            .common
+            .xwayland_state
+            .as_mut()
+            .and_then(|xstate| xstate.xwm.as_mut())
+        {
+            if let Err(err) =
+                xwm.send_selection(target, mime_type, fd, self.common.event_loop_handle.clone())
+            {
+                warn!(?err, "Failed to send selection (X11 -> Wayland).");
+            }
+        }
+    }
+}