Comment 3 for bug 1625401

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Alan Griffiths (alan-griffiths) wrote : Re: Miral seems to spin at 100% and steals focus from everything until the server shutdown

The system is looping in msh::AbstractShell::focus_next_session().

This can happen if two conditions apply:

1. All sessions have a null default_surface(); and,
2. focused_session is null.

That makes it a Mir bug.