global diffmergeid diffpindex parents nparents diffmergegca
global treediffs mergefilelist diffids treepending
# diff the child against each of the parents, and diff
# each of the parents against the GCA.
while 1 {
global diffmergeid diffpindex parents nparents diffmergegca
global treediffs mergefilelist diffids treepending
# diff the child against each of the parents, and diff
# each of the parents against the GCA.
while 1 {