### 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)

_THREAD_SAFE_METHOD_
	if (p_mode == mouse_mode) {
		return;
	}
	if (mouse_mode == MOUSE_MODE_CAPTURED || mouse_mode == MOUSE_MODE_CONFINED || mouse_mode == MOUSE_MODE_CONFINED_HIDDEN) {
		XUngrabPointer(x11_display, CurrentTime);
	}
	
	bool show_cursor = (p_mode == MOUSE_MODE_VISIBLE || p_mode == MOUSE_MODE_CONFINED);
	bool previously_shown = (mouse_mode == MOUSE_MODE_VISIBLE || mouse_mode == MOUSE_MODE_CONFINED);
	if (show_cursor && !previously_shown) {
		WindowID window_id = get_window_at_screen_position(mouse_get_position());
		if (window_id != INVALID_WINDOW_ID) {
			_send_window_event(windows[window_id], WINDOW_EVENT_MOUSE_ENTER);
		}
	}
	for (const KeyValue<WindowID, WindowData> &E : windows) {
		if (show_cursor) {
			XDefineCursor(x11_display, E.value.x11_window, cursors[current_cursor]); 
		} else {
			XDefineCursor(x11_display, E.value.x11_window, null_cursor);