### 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

/
if (p_from == graph) {
		Dictionary d = p_data;
		if (d.has("id")) {
			return true;
		}
		if (d.has("files")) {
			return true;
		}
	}
	return false;
}
void VisualShaderEditor::drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) {