Report bug (and patch) with conditional preprocessing and scan

diff --git a/doc/bugs/conditional_preprocess_during_scan.mdwn b/doc/bugs/conditional_preprocess_during_scan.mdwn
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+[[!template id=gitbranch branch=GiuseppeBilotta/scanif author="Giuseppe Bilotta"]]
+
+When a directive that should be run during scan preprocessing is inside
+an if directive, it doesn't get called because the if preprocessing does
+not run during scan.
+
+I've written a simple [[patch]] to fix the issue, currently hosted on the
+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.