### Godot version

v4.1.1.stable.official [bd6af8e0e]

### System information

Godot v4.1.1.stable - Debian GNU/Linux trixie/sid trixie - Vulkan (Compatibility) - Mesa Intel(R) HD Graphics 520 (SKL GT2) () - Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz (4 Threads)

### Issue description

After right clicking in thet "Filter Nodes" menu in the scene tree dock, the sub-menu is populated with a "Search" icon.

If I later switch themes in the same session, this icon is never updated to match the new theme.

![image](https://github.com/godotengine/godot/assets/660911/14336bb3-12ca-48c8-b030-8ada6ac27ec6)


### Steps to reproduce

1. Right click in the "Filter Nodes" menu in scene tree dock
2. Switch themes
3. Right click again in the "Filter Nodes" menu

Expected result: Icon has updated to match the theme I am currently using
Actual result: Icon is still using the theme I launched Godot with

### Minimal reproduction project

N/A
if (selected_shader_material.is_null()) {
		return;
	}
	String path = selected_shader_material->get_path();
	if (path.is_empty()) {
		String root_path;
		if (editor_data->get_edited_scene_root()) {
			root_path = editor_data->get_edited_scene_root()->get_scene_file_path();
		}
		String shader_name;
		if (selected_shader_material->get_name().is_empty()) {
			shader_name = root_path.get_file();
		} else {
			shader_name = selected_shader_material->get_name();
		}
		if (root_path.is_empty()) {
			path = String("res://").path_join(shader_name);
		} else {
			path = root_path.get_base_dir().path_join(shader_name);
		}
	}
	shader_create_dialog->connect("shader_created", callable_mp(this, &SceneTreeDock::_shader_created));
	shader_create_dialog->connect("confirmed", callable_mp(this, &SceneTreeDock::_shader_creation_closed));
	shader_create_dialog->connect("canceled", callable_mp(this, &SceneTreeDock::_shader_creation_closed));
	shader_create_dialog->config(path, true, true, -1, p_preferred_mode);
	shader_create_dialog->popup_centered();
}
void SceneTreeDock::open_shader_dialog(const Ref<ShaderMaterial> &p_for_material, int p_preferred_mode) {