Comment # 16 on bug 1058204 from Ulrich Windl

As seen in comment #0 (original version), "-N --continue" tries to resume the
download, while in comment #13 (new version) "--continue" is ignored if "-N" is
present.
When using a script, it's hard for the script to tell whether the last download
completed or not, so you would use -N to prevent creating a new file for every
download if the file is already there, also avoiding to download a version that
is already there, and you would use --continue to continue an incomplete
download. Most people won't care about such differences, but it took two days
(with interruptions) to download that big file.
Or in short: Your fix seems to change the semantics of wget.