How to save/restore camera view on open3d::visualization::gui::SceneWidget

I'm attempting to reproduce the behavior of `Visualizer`'s copy/paste for camera views, but I can't seem to find the right combination of camera parameters to save and restore to accomplish it for `SceneWidget`.

I'm able to capture current camera information using the `SceneWidget::SetOnCameraChanged` callback, but I can't seem to find the right combination of details and where they need to be specified to later restore the SceneWidget's view based on those values (through calls to `SetupCamera`, `LookAt`, `SetCenterOfRotation`, or something else).

Any help would be most appreciated.

version: 0.13.0
api: c++