### 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

/
Ref<VisualShaderNode> node = visual_shader->get_node((VisualShader::Type)p_type, p_node);
	if (!node->is_closable()) {
		return;
	}
	List<int> to_erase;
	to_erase.push_back(p_node);
	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
	undo_redo->create_action(TTR("Delete VisualShader Node"));
	_delete_nodes(p_type, to_erase);
	undo_redo->commit_action();
}
void VisualShaderEditor::_delete_nodes_request(const TypedArray<StringName> &p_nodes) {
	List<int> to_erase;
	if (p_nodes.is_empty()) {
		
		for (int i = 0; i < graph->get_child_count(); i++) {
			GraphElement *graph_element = Object::cast_to<GraphElement>(graph->get_child(i));
			if (graph_element && graph_element->is_selected()) {
				VisualShader::Type type = get_current_shader_type();
				int id = String(graph_element->get_name()).to_int();
				Ref<VisualShaderNode> vsnode = visual_shader->get_node(type, id);
				if (vsnode->is_closable()) {
					to_erase.push_back(graph_element->get_name().operator String().to_int());