AnimationPlayer -> Animation -> Manage Animations UI force folding Bug

### Tested versions

Godot 4.4.1 stable

### System information

Win11 + AMD 8845HS

### Issue description

If there are a lot of animations ,when delete any single animation ,Manage Animation UI will force folding,
but if there are only a few animations ,It will work fine.

See the video for details[

https://github.com/user-attachments/assets/fecda76d-46a4-4f9a-8938-33b6bef319a2

](url)

### Steps to reproduce

1, AnimationPlayer -> Animation -> Manage Animations
2, Delete any single animation

### Minimal reproduction project (MRP)

[4.4.1-manage_animation.zip](https://github.com/user-attachments/files/20271583/4.4.1-manage_animation.zip)

Start by opening the supplied 4.4.1-manage_animation.zip project in the Godot editor and reproduce the issue through AnimationPlayer → Animation → Manage Animations with many animations. Trace that UI entry point in the editor sources, then verify that deleting one animation leaves the Manage Animations UI expanded; repeat with both many and few animations.

Written by the indexing model from the issue text.