Code review comment for lp:~raof/mir/input-methods-can-specify-foreign-parents

We had a brief discussion on this - I'll make a 0.13.3 release that will include some version of this: https://code.launchpad.net/~albaguirre/mir/fix-1465883/+merge/262160
which will fix the original issue this branch had. Then no workarounds should be needed.