Code review comment for lp:~alan-griffiths/miral/pre_init-CommandLineOption

For the record, I can confirm that the feature addresses the concern discussed in https://github.com/yunit-io/unity-system-compositor/issues/1#issuecomment-322532709.

As for the question of default behaviour: (i) the flexibility to choose between pre- and post-init handling of command line options seems useful in principle and (ii) I'd rather not have a breaking change in a minor release.