Code review comment for lp:~vanvugt/mir/reverse-scene-traversal

Alan,

As it happens, I too decided just this week I would like to see:
    auto surfaces = scene->select(filter);
or
    auto surfaces = scene->snapshot();

However I am sticking with the current design at present, in an effort to make small incremental steps that are still potentially saucy-compatible. My immediate goal is to resolve bug 1227739 in or soon-after saucy is released. That means using existing interfaces.