This patch is in the Slackware koffice 1.6.3 build set. I don't know what the patch provides.

http://slackware.mirrors.tds.net/pub/slackware/slackware-12.2/source/kde/koffice/KWDocument.cpp.diff

The date of the patch is Aug 28, 2008, which is about when 3.5.10 was released, but about a year after koffice 1.6.3 was released. Possibly yet another patch the KDE developers refused to merge.

Darrell