Inconsistent behavior when undoing animation bezier movements upon selection of different animations

[CookieBadger]

Tested versions

• Reproducible in 4.2.1 and master (9425535)

System information

Windows 10

Issue description

When manipulating bezier keys and then selecting a different Animation, or a different AnimationPlayer, bad things are bound to happen on undo and redo, due to the animation_bezier_editor referencing the currently selected animation in the undo methods.

Steps to reproduce

1. Select AnimationPlayer, go into bezier view and move a key
2. Select a different AnimationPlayer
3. Undo (observe an index out of bounds error in the output)
4. Redo (observe that the key is now transferred to the currently selected animation)

Minimal reproduction project (MRP)

AnimationTestProject2.zip

[CookieBadger]

damn, that was fast :D

I am working on a fix for this.