Fix closing an XWayland window doing nothing on both backends

Platform::close only ever called w.toplevel(), which is None for an
XWayland window - closing one (the WM's own close binding, or `srd
dispatch close`) silently did nothing at all, on both udev and winit.
Found live: a leftover untitled fullscreen window wouldn't close via
srd dispatch close even after several seconds, tracing back to this.

Fixed by falling back to X11Surface::close() when there's no xdg
toplevel - it already handles both cases smithay-side (a polite
WM_DELETE_WINDOW for a cooperating client, outright destroy_window for
one that doesn't support it), so no new logic was needed, just calling
it.

1 files changed, 11 insertions, 2 deletions

diff --git a/crates/wayland/src/udev/platform.rs b/crates/wayland/src/udev/platform.rs
index bf887b1..8043e20 100644
--- a/crates/wayland/src/udev/platform.rs
+++ b/crates/wayland/src/udev/platform.rs
@@ -355,8 +355,17 @@ impl Platform for UdevPlatform {
     }
 
     fn close(&mut self, window: srdwm_core::WindowId) -> PlatformResult<()> {
-        if let Some(w) = self.state.id_to_window.get(&window).and_then(|w| w.toplevel()) {
-            w.send_close();
+        let Some(w) = self.state.id_to_window.get(&window) else { return Ok(()) };
+        if let Some(toplevel) = w.toplevel() {
+            toplevel.send_close();
+        } else if let Some(x11) = w.x11_surface() {
+            // `w.toplevel()` is `None` for an XWayland window - without
+            // this arm, closing one (the WM's own close binding, or `srd
+            // dispatch close`) silently did nothing at all. `close()` itself
+            // handles both cases: a polite WM_DELETE_WINDOW for a
+            // cooperating client, outright `destroy_window` for one that
+            // doesn't support it.
+            let _ = x11.close();
         }
         Ok(())
     }