### 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

/
item->set_icon(0, get_editor_theme_icon(SNAME("int")));
				break;
			case VisualShaderNode::PORT_TYPE_SCALAR_UINT:
				item->set_icon(0, get_editor_theme_icon(SNAME("uint")));
				break;
			case VisualShaderNode::PORT_TYPE_VECTOR_2D:
				item->set_icon(0, get_editor_theme_icon(SNAME("Vector2")));
				break;
			case VisualShaderNode::PORT_TYPE_VECTOR_3D:
				item->set_icon(0, get_editor_theme_icon(SNAME("Vector3")));
				break;
			case VisualShaderNode::PORT_TYPE_VECTOR_4D:
				item->set_icon(0, get_editor_theme_icon(SNAME("Vector4")));
				break;
			case VisualShaderNode::PORT_TYPE_BOOLEAN:
				item->set_icon(0, get_editor_theme_icon(SNAME("bool")));
				break;
			case VisualShaderNode::PORT_TYPE_TRANSFORM:
				item->set_icon(0, get_editor_theme_icon(SNAME("Transform3D")));
				break;
			case VisualShaderNode::PORT_TYPE_SAMPLER:
				item->set_icon(0, get_editor_theme_icon(SNAME("ImageTexture")));
				break;
			default:
				break;
		}
		item->set_meta("id", options[i].temp_idx);
	}
}
void VisualShaderEditor::_set_mode(int p_which) {