I'm happy to announce that I've ported the checklist plugin created by @lightyear to run on the latest version of Discourse.
You can find the new repo at https://github.com/cpradio/discourse-plugin-checklist
With this release comes a few enhancements.
- You can disable the plugin in its entirety from the Admin > Settings area (strike through still gets processed, but the checkboxes won't render and won't be clickable)
- You can keep checking/unchecking boxes on the same post without having to refresh the page.
Any issues should be reported either here or via a GitHub issue. I also welcome translation file PRs, or general enhancement PRs.