`StringRefNull` cannot reference a `nullptr` string, and so `uiDefAutoButR()` should get a `std::nullopt` instead of `nullptr`. Pull Request: https://projects.blender.org/blender/blender/pulls/132852
`StringRefNull` cannot reference a `nullptr` string, and so `uiDefAutoButR()` should get a `std::nullopt` instead of `nullptr`. Pull Request: https://projects.blender.org/blender/blender/pulls/132852