See https://developer.blender.org/D9499. * Use C++17 nested namespaces. * Use `_` suffix rather than prefix for private member variables. Also: Simplify code visually in `tree_view.cc` with `using namespace`.
See https://developer.blender.org/D9499. * Use C++17 nested namespaces. * Use `_` suffix rather than prefix for private member variables. Also: Simplify code visually in `tree_view.cc` with `using namespace`.