Code review comment for lp://staging/~andreas-pokorny/qtmir/keep-mir-types-alive

> Objects that need to be kept alive are typically owned in libmirserver not by
> downstream projects.
>
> It seems to me that the right fix is in Mir. Mir should own the
> ExternalInputDeviceHub by attaching it to mir::DisplayServer::Private, or
> something that this owns.

For example: lp:~alan-griffiths/mir/preserve-ExternalInputDeviceHub/+merge/321845