### Godot version

v4.0.beta15.mono.official [4fa6edc88]

### System information

Linux, Xorg

### Issue description

The entire window loses focus if you ungrab focus from a Control. 
This doesn't seem to happen in Beta 14 and older betas.

### Steps to reproduce

1. Create a Control that can grab focus (tested with LineEdit and TextEdit)
2. Grab focus
3. Release focus via release_focus() or hiding the node

### Minimal reproduction project

[FocusMinimal.zip](https://github.com/godotengine/godot/files/10498175/FocusMinimal.zip)

XFlush(x11_display);
	
	XEvent ev = {};
	while (XCheckIfEvent(x11_display, &ev, _predicate_all_events, nullptr)) {
		
		if (XFilterEvent(&ev, None)) {
			
			
			continue;
		}
		
		
		
		if (ev.type == SelectionRequest) {
			_handle_selection_request_event(&(ev.xselectionrequest));
			continue;
		}
		r_events.push_back(ev);
	}
}
DisplayServer::WindowID DisplayServerX11::window_get_active_popup() const {