### Godot version

v4.2.beta2.official [f8818f85e]

### System information

Windows 10, 64bit

### Issue description

Some times can't add node in visualshader editor

### Steps to reproduce

1. Open a VisualShader file for edit.
2. Click the `Add Node...` button, it will popup menu, it is OK.
3. Direct close the menu.
4. Clikd the `Add Node...` again, the menu can't popup.
![GIF](https://github.com/godotengine/godot/assets/35988767/1326c63e-3e05-4423-9ec7-7ce305b3f4f5)

### Minimal reproduction project

/
TreeItem *item = varyings->get_selected();
	if (item != nullptr) {
		_remove_varying(item->get_text(0));
		remove_varying_dialog->hide();
	}
}
void VisualShaderEditor::_varying_selected() {
	add_varying_dialog->get_ok_button()->set_disabled(false);
}
void VisualShaderEditor::_varying_unselected() {
	add_varying_dialog->get_ok_button()->set_disabled(true);
}
void VisualShaderEditor::_tools_menu_option(int p_idx) {