Hi Don, Here's a fix to make filter use the same semantics as delete. There are no properties for filter, and it's only used once, to remove the floating windows from the stack before tiling them, and in this one case, I believe the ideal semantics--for tiling algorithms that are focus-dependent--would be to match the semantics of delete, so that if the floating window that currently has the focus is deleted the tiling of the tiled layer won't change. That seems most reasonable to me. David Sun Jun 24 07:48:54 PDT 2007 David Roundy * simplify StackSet.delete Wed Jun 27 06:40:51 PDT 2007 David Roundy * fix filter semantics to match delete.