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There is an intermittent fault when opening some help topics via the tree
control in yelp.  The problem only seems to occur on items in child nodes
of other parent nodes (not those directly off the root of the tree).

For example, if you open yelp and select 'GNU Info Pages' > 'General
Commands' > 'sed' to open a help topic that uses the tree view control,
then expand 'Examples' and single-click a sub category, yelp often crashes
with the following error:

**
** Yelp:ERROR:(yelp-document.c:217):yelp_document_get_page: assertion failed: (document != NULL && YELP_IS_DOCUMENT (document))
Aborted


Tested on a clean install of Debian 5.0.4 from first DVD.