EditorUndoRedoManager is polluting scene history.

[Rubonnek]

Under certain scenarios the usage of EditorUndoRedoManager in the LimboAI Editor plugin will pollute the scene history when it shouldn't -- for example when creating a new BehaviorTree and adding tasks to it while on an empty scene.

This will make will make undo/redo operations error out from time to time and not work as expected sometimes.

Since EditorUndoRedoManager is not able to automatically track parent/child relationships of Resource objects (which include BTTask), we need a way to force it to use a specific undo/redo history in order to properly manage undo/redo operations in the Editor.

Once the following patch is merged upstream, the LimboAI Editor undo/redo operations can be properly fixed.

• Add a way to force history for undoredo godotengine/godot#79796