Invalid for GTK. I have now reproduced the same bug using a pure Mir demo (which is software rendered in case that's relevant):
$ mir_demo_client_progressbar 20 --desktop_file_hint=unity8
Invalid for GTK. I have now reproduced the same bug using a pure Mir demo (which is software rendered in case that's relevant):
$ mir_demo_ client_ progressbar 20 --desktop_ file_hint= unity8