Collapse and decollapse icon still shown even though there's no child in the drawer

[ReDarkTechnology]

Description of the bug

I used the GameObjectFilter feature in RuntimeHierarchy to hide billboard objects with this script

hierarchy.GameObjectFilter += (Transform obj) => {
    return obj.GetComponent<BillboardSprite>() == null;
};

But it still shows the collapse and decollapse icon

Reproduction steps

• Create a GameObject and RuntimeHierarchy
• Create a child for the GameObject
• Filter the child of the GameObject so that all of the childs in the GameObject won't be shown in the hierarchy using GameObjectFilter
• Done, collapse and decollapse icon is still shown in the RuntimeHierarchy even though all the childs are filtered

Platform specs

Please provide the following info if this is a Unity 3D repository.

• Unity version: 2021.3.33f1
• Platform: Android, Windows, Editor
• Device: Windows 11, Android 12
• How did you download the plugin: GitHub Releases

Additional info No log.

[yasirkula]

Yes this is a known issue. To avoid this issue, at each RuntimeHierarchy refresh, each Transform with children must iterate over all of their children to see if all of them are filtered out. For Transforms with lots of children, my initial assumption is that that'll take considerable amount of time. If you have any ideas, please let me know.