Instanced Actors: Moving element in editor is not undoable

Context

Instanced Actors can be moved by unchecking Lock Instance Locations on an IAM, and double-clicking into the actor → comp → instance to select an instance.

Problem

Moving an IA via the gizmo isn’t properly recorded as an undoable/redoable transaction. It can’t be undone or redone.

Suggested Fix

For user friendliness, the action should be undoable.

• Open attached repro project
• Open MAP_ReproPCG
• Select an InstancedActorManager (IAM)
• Uncheck Lock Instance Location
• Double-click one of the Instanced Actors of the IAM in the viewport to select the component
• Double-click it again to select the element. It should show a transform gizmo.
• Move the instance via the transform gizmo.
• Press Ctrl+Z to attempt to undo the movement
• Observe: The movement isn’t undone. Instead, it undoes the selection actions from before.
• Expected: The movement is undone.