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[no subject]

:expose, :select, :deexpose and :deselect operations on windows,
as well as a few others, now require that the screen layout be
locked.  This change is so that the window system can survive
together with interrupts.  To lock the layout, put a call to
the macro LOCK-SCREEN-LAYOUT around the code.  Nobody else can
change the exposed or selected windows while the layout is locked.