### Godot version

4.1.dev (dc625bcbfc5b587ba8867481ee7a1f6a567c25d0)

### System information

Mageia 9, Linux

### Issue description

When importing a project in current `master`, the following error is raised for each asset that gets imported:
```
Attempting to parent and popup a dialog that already has a parent.
```

It seems to be raised once per asset, caused by the progress dialog.

CC @bruvzg

### Steps to reproduce

- Import a new project in Godot that contains importable assets, e.g. https://github.com/RPicster/godot4-demo-desert-light

### Minimal reproduction project

See above.
ERR_MAIN_THREAD_GUARD;
	
	
	Ref<InputEventMouseMotion> mm;
	Vector2 pos = get_mouse_position();
	Transform2D xform = get_global_canvas_transform().affine_inverse();
	mm.instantiate();
	mm->set_position(pos);
	mm->set_global_position(xform.xform(pos));
	mm->set_device(InputEvent::DEVICE_ID_INTERNAL);
	push_input(mm);
}
void Window::show() {
	ERR_MAIN_THREAD_GUARD;
	set_visible(true);
}
void Window::hide() {