Code review comment for lp:~alan-griffiths/mir/0.28.1-to-ubuntu

> I'm still seeing bug 1720223 on the mesa-drm platform

Actually, that was bug 1728574

But still voting "needs fixing" as the following test is failing on artful:

Mir-on-Mir

    Use an X11 based desktop (Unity, Gnome, etc.). These tests run for a default 10 seconds.
    Start two terminal sessions, one for a "host" server, one to launch the tests.

        Start a "host" server: $ mir_demo_server --window-manager system-compositor
    Test that S/W rendering clients run and can be moved(resized) with Alt+Left(Middle)-Button:

...

        $ mir_demo_server --no-file --host $XDG_RUNTIME_DIR/mir_socket --test-timeout 10 --test-client mir_demo_client_egltriangle

When resizing the triangle, the nested server crashes. (Doesn't happen with the same code built for Zesty.)