Bug: Unrelated slot folders expand when adjusting draw order after folder split

[badlogic]

Description

When slot folders are separated due to changes in the draw order within an animation, changing the draw order of a slot in one of the separated folders causes the other unaffected folder to expand as well. This is disruptive to the workflow, especially when working with complex hierarchies.

Reproduction

1. Download the attached .zip file: 988-subfolders-expanding-issue.zip
2. Open the Spine project file included in the package using Spine 4.3.53-beta.
3. Switch to animate mode and enable the filter for the slots in the tree view:
4. Of the two A folders, expand only the one at the bottom, select the A2 slot, and drag it to the bottom.
5. The moment you release the mouse button, you'll see that the A folder at the top has also been expanded:

Expected Behavior

Even if they were originally in the same folder, if they are split within an animation, changing the draw order of slots within that folder will not expand the separate folders.

Version

Spine 4.3.53-beta

Source

Forum discussion: https://esotericsoftware.com/forum/d/29901-새로-추가된-드로우오더-폴더키에-대한-궁금증/3

Video demonstration: https://ko.esotericsoftware.com/forum/assets/files/2026-03-24/1774325542-596030-4-3-50.mp4

[NathanSweet]

A folder can appear 1 or more times in animate mode, and this can change every frame. There is no stable identity of these instances across frames. Since they are truly the same folder, expanding/collapsing one will expand/collapse all instances of the same folder.

4.3.56-beta