When copying lots of small files (e.g. the
j2sdk1.4/docs/api directory), the computation of the
current progress is done wrong.
While the computation for the total size is accurate,
somehow during the copy process the computed
progress becomes too big.
Logged In: YES
user_id=940779
e.g. the progress bar shows 100% but copying continues, or
copying ends but progress bar does not reach 100%
Logged In: YES
user_id=1380244
TODO: as a performance improvement for copying lots of small
files, do not force update of stats at the end of each file,
but at the end of the whole copy operation