Find a good solution to diff PDF and Office spreadsheet (.xls, .xlsx, .ods) files through an HTML conversion and activate the HTML content diff link for these files

There are 2 issues when applying the HTML content differ (daisydiff) to PDF and Office spreadsheet files converted to HTML (using the default pdf2html or office2html converters):

• It is not always visually satisfactory, depending on the complexity of the files (OK on simple files, not OK on bigger ones with TOC, images, ...)
• For some files it leads to a java.lang.OutOfMemoryError: GC overhead limit exceeded error, see NXP-9414 for a PDF case and NXP-9448 for an XLS one.

For now we don't suggest the HTML content diff for these files, but only the text content diff that works well.
We would like to find a good way to do this and activate the HTML content diff link for these files.