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...according to changes in issue 230000
implemented in http://hg.netbeans.org/main/misc/rev/1e64fad6bdd4; will be deployed soon (will leave a note here)
http://hg.netbeans.org/main/misc/rev/969177964c9b is needed as well, to properly report to bugzilla.
http://hg.netbeans.org/main/misc/rev/7fc0fd9c6db5 and http://hg.netbeans.org/main/misc/rev/d20b25e133e4 should secure proper duplicating under all circumstances. Fixes were tested and deployed to production.