The dispatch window event causes problems

[SergioRibera]

I am developing an application to display emojis, and I want it to behave in such a way that when the mouse leaves the window, it closes. I am achieving this with this code

        self.window.window().on_winit_window_event({
            let no_close = self.settings.no_close;
            move |w, ev| match ev {
                WindowEvent::CursorLeft { .. } => (!no_close)
                    .then(|| w.hide().ok())
                    .flatten()
                    .map(|_| EventResult::PreventDefault)
                    .unwrap_or(EventResult::Propagate),
                _ => EventResult::Propagate,
            }
        });

But the problem is that it throws this error and apparently in wayland desktop environments, the window does not close
Slint winit backend: request to hide window failed because references to the window still exist. This could be an application issue, make sure that there are no slint::WindowHandle instances left

If you would like more context, the source code is here https://github.com/SergioRibera/Simplemoji/blob/25e89dc58e4bdeddfa38999383a271610ffa3c1e/src/app.rs#L246-L256, and the issue that was opened for me is this one SergioRibera/Simplemoji#51

The curious thing is that it behaves very similarly. When copying an emoji, slint's DSL invokes an event called close, which calls this function in Rust, and the window closes completely without throwing any errors. I'm probably doing something wrong, and I would appreciate some help

Source with more context: https://github.com/SergioRibera/Simplemoji/blob/25e89dc58e4bdeddfa38999383a271610ffa3c1e/src/app.rs#L258-L287

                if close {
                    window
                        .upgrade()
                        .unwrap()
                        .window()
                        .dispatch_event(slint::platform::WindowEvent::CloseRequested);
                }

[SergioRibera]

Solved, now I quit the event_loop directly

self.window.window().on_winit_window_event({
    let no_close = self.settings.no_close;
    move |_w, ev| match ev {
        WindowEvent::CursorLeft { .. } => (!no_close)
+            .then(|| slint::quit_event_loop().ok())
            .flatten()
            .map(|_| EventResult::PreventDefault)
            .unwrap_or(EventResult::Propagate),
        _ => EventResult::Propagate,
    }
});

[tronical]

That's a clever solution:).

Yeah the problem is hard, unfortunately. Winit folks say that in order to hide a window on Wayland you need to destroy the winit window. But for this callback to work, we need to keep an Rc of it, so hide() can't remove the last reference count.