Unnecessary diffs shown in iddiff tool

[lesginsberg]

The new iddiff tool shows spurious diffs - apparently in cases where page breaks occur in different places in the two documents.

Here is an example using the new tool: https://author-tools.ietf.org/diff?doc_1=rfc8920&url_2=https://www.ietf.org/archive/id/draft-ppsenak-lsr-rfc8920bis-00.txt

Here is an example using the old rfcdiff tool on the same two files: https://tools.ietf.org//rfcdiff?url1=rfc8920&url2=https://www.ietf.org/archive/id/draft-ppsenak-lsr-rfc8920bis-00.txt