gpui_linux: Release X11 client state before close callback (#63089)

Release Notes:

- Fixed double-lease panic on X11 when reacting to WM_DELETE_WINDOW
event.

crates/gpui_linux/src/linux/x11/client.rs

@@ -820,15 +820,19 @@ impl X11Client {
             Event::ClientMessage(event) => {
                 let window = self.get_window(event.window)?;
                 let [atom, arg1, arg2, arg3, arg4] = event.data.as_data32();
-                let mut state = self.0.borrow_mut();
+                let delete_window_atom = self.0.borrow().atoms.WM_DELETE_WINDOW;
 
-                if atom == state.atoms.WM_DELETE_WINDOW && window.should_close() {
-                    // window "x" button clicked by user
-                    // Rest of the close logic is handled in drop_window()
-                    drop(state);
-                    window.close();
-                    state = self.0.borrow_mut();
-                } else if atom == state.atoms._NET_WM_SYNC_REQUEST {
+                if atom == delete_window_atom {
+                    if window.should_close() {
+                        // window "x" button clicked by user
+                        // Rest of the close logic is handled in drop_window()
+                        window.close();
+                    }
+                    return Some(());
+                }
+
+                let mut state = self.0.borrow_mut();
+                if atom == state.atoms._NET_WM_SYNC_REQUEST {
                     window.state.borrow_mut().last_sync_counter =
                         Some(x11rb::protocol::sync::Int64 {
                             lo: arg2,