This bug https://bugzilla.redhat.com/show_bug...iple&id=806689
is in the currently shipped xfig package of slackware-current.
It's already fixed in the latest xfig version (3.2.5c).
EDIT: This also fixed some other bugs such as some objects are not selectable, and longer text objects are broken down into smaller ones. These bugs made the xfig in slackware-current rather unuseful as a figure editor.