Code review comment for lp:~raof/mir/better-buffer-plumbing

This breaks when starting a load of clients. (I built lp:miral against it and...)

$ cat `which mir_demo_client_all`
#!/bin/sh
mir_demo_client_animated_cursor&mir_demo_client_eglsquare&mir_demo_client_prerendered_frames&mir_demo_client_basic&mir_demo_client_eglstateswitcher&mir_demo_client_progressbar&mir_demo_client_camera&mir_demo_client_egltriangle&mir_demo_client_prompt_session&mir_demo_client_cursors&mir_demo_client_fingerpaint&mir_demo_client_release_at_exit&mir_demo_client_display_config&mir_demo_client_flicker&mir_demo_client_scroll&mir_demo_client_eglcounter&mir_demo_client_input_shapes&mir_demo_client_target&mir_demo_client_eglflash&mir_demo_client_multistream&mir_demo_client_tooltip&mir_demo_client_eglplasma&mir_demo_client_multiwin&mir_demo_client_touch_validator&

$miral-app

[in the miral terminal]
$ mir_demo_client_all

Expect: all the demos clients start
Actual: miral-shell crashes

I don't see this without this MP.