fixed bug where windows with parents would get negative y positions, which some windows managers handled okay, but others (I am looking at you OS X) layed windows out in bad locations
fixed bug where windows with parents would get negative y positions, which some windows managers handled okay, but others (I am looking at you OS X) layed windows out in bad locations

brett-patterson/pyface,geggo/pyface,pankajp/pyface,geggo/pyface