### 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.
window_transform.translate_local(margin);
				if (final_size.x != 0 && final_size.y != 0) {
					Transform2D scale_transform;
					scale_transform.scale(Vector2(attach_to_screen_rect.size) / Vector2(final_size));
					window_transform *= scale_transform;
				}
			} break;
		}
	}
	bool allocate = is_inside_tree() && visible && (window_id != DisplayServer::INVALID_WINDOW_ID || embedder != nullptr);
	_set_size(final_size, final_size_override, allocate);
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		RenderingServer::get_singleton()->viewport_attach_to_screen(get_viewport_rid(), attach_to_screen_rect, window_id);
	} else {
		RenderingServer::get_singleton()->viewport_attach_to_screen(get_viewport_rid(), Rect2i(), DisplayServer::INVALID_WINDOW_ID);
	}
	if (window_id == DisplayServer::MAIN_WINDOW_ID) {
		if (!use_font_oversampling) {
			font_oversampling = 1.0;
		}
		if (TS->font_get_global_oversampling() != font_oversampling) {
			TS->font_set_global_oversampling(font_oversampling);
		}
	}
	notification(NOTIFICATION_WM_SIZE_CHANGED);
	if (embedder) {
		embedder->_sub_window_update(this);
	}
}
void Window::_update_window_callbacks() {