Undoing a duplicate animation causes the timeline to disappear

[misaki-eymard]

Description:
If you duplicate an animation and undo the duplication, the animation's selection changes, but the animation's timeline is not displayed in the Dopesheet view. Reselecting the animation in the Tree view or Animation view solves this problem, but this seems to be a bug since 4.2, as Spine 4.1 did not have this display condition.

Expected behavior:
The timeline of the currently selected animation is still displayed after undoing the animation duplicate.

Steps to reproduce:

1. Open any Spine project, such as Spineboy, with Spine 4.2.
2. Select any animation and duplicate it from the Duplicate button in the Tree view.
3. Press Ctrl+Z to undo the duplicate.
4. You can see that the timeline that was displayed in the Dopesheet view is no longer displayed. Incidentally, even if you change the selection status of bones, the timeline will remain invisible.

The version of Spine in which this issue was found:
Spine 4.2.38

This issue was reported in the following thread on the forum:
https://esotericsoftware.com/forum/d/27872-ghost-timelines-bug-4238