### 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

/
editor->call_deferred(SNAME("_input_select_item"), input, get_item_text(p_item));
	}
	void setup(VisualShaderEditor *p_editor, const Ref<VisualShaderNodeInput> &p_input) {
		editor = p_editor;
		input = p_input;
		Ref<Texture2D> type_icon[] = {
			EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("float"), EditorStringName(EditorIcons)),
			EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("int"), EditorStringName(EditorIcons)),
			EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("uint"), EditorStringName(EditorIcons)),
			EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("Vector2"), EditorStringName(EditorIcons)),
			EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("Vector3"), EditorStringName(EditorIcons)),
			EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("Vector4"), EditorStringName(EditorIcons)),
			EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("bool"), EditorStringName(EditorIcons)),
			EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("Transform3D"), EditorStringName(EditorIcons)),
			EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("ImageTexture"), EditorStringName(EditorIcons)),
		};
		add_item("[None]");
		int to_select = -1;
		for (int i = 0; i < input->get_input_index_count(); i++) {
			if (input->get_input_name() == input->get_input_index_name(i)) {
				to_select = i + 1;
			}
			add_icon_item(type_icon[input->get_input_index_type(i)], input->get_input_index_name(i));
		}
		if (to_select >= 0) {
			select(to_select);
		}
	}
};
class VisualShaderNodePluginVaryingEditor : public OptionButton {