`cowplot::plot_grid()` and downstream helpers dispatch through `cowplot::as_grob()`. Registering the method on the `gglist` class keeps the compatibility with `cowplot` close to the `gglist` implementation itself.
`cowplot::plot_grid()` and downstream helpers dispatch through `cowplot::as_grob()`. Registering the method on the `gglist` class keeps the compatibility with `cowplot` close to the `gglist` implementation itself.