In this fork I found fixes for bugs, which were not known to me previously, what probably means, that it’s well tested. This is also the only fork (as far as I can tell), that suggested a fix for Redmine 3.3+.
- https://github.com/VoronyukM/issue_id by Mikhail Voronyuk
In his fork Mikhail fixed all the bugs, which were known/reported to me (some of such bugs were reported by him). That is, he did what I should have done long before.
Another attempt to make the plugin run under Redmine 3.x. Not sure if successful (I did not test).