scanif branch of my repository. The patch also passes the preview option
back to the Ikiwiki::preprocess call, making sure that whatever is being
reprocessed is done so in the same conditions as the original call.
+
+> One problem with this is that it has the same dependency-ordering problems
+> as inline-based or pagespec-based trails with my [[plugins/contrib/trail]]
+> plugin: `if` takes a pagespec, but pagespecs aren't guaranteed to match
+> correctly until everything has been scanned (for instance, `link()` might
+> give the wrong results because a page that added or deleted a link hasn't
+> been scanned yet). If you have a clever idea for how to fix this, I'd love
+> to hear it - being able to specify a [[plugins/contrib/trail]] in terms
+> of a sorted pagespec would be useful. --[[smcv]]