Where a box goes before the user moves it: stacked upward from the stage's bottom-right corner, the newest
(index 0) in the corner. keepClear is a box along the stage's foot that the stack stands on, such as the host's
call controls: when the box in the corner would cover any of it, the stack starts above its top edge instead of at
the stage's bottom. A stack taller than the room keeps going past the top; ClampPipBox pulls each box back
inside.
Where a box goes before the user moves it: stacked upward from the stage's bottom-right corner, the newest (
index0) in the corner.keepClearis a box along the stage's foot that the stack stands on, such as the host's call controls: when the box in the corner would cover any of it, the stack starts above its top edge instead of at the stage's bottom. A stack taller than the room keeps going past the top; ClampPipBox pulls each box back inside.