gtk-doc 1.7 released. the gtk-doc-1.6-r1-no_dupe_ids.patch is no longer necessary as those exact changes are in the upstream package. ebuild and ebuild diff attached.
Created attachment 93154 [details] gtk-doc-1.7.ebuild
Created attachment 93155 [details, diff] gtk-doc-1.7.ebuild.diff
Now in the tree, thanks for the report.