This plugin is golden ❤️
It's kept simple and does the job very well 👍

Then I was reading git config options, I saw mergetool.hideResolved (added somewhere in 2021):

During a merge Git will automatically resolve as many conflicts as possible and write the MERGED file containing conflict markers around any conflicts that it cannot
resolve; LOCAL and REMOTE normally represent the versions of the file from before Git's conflict resolution. This flag causes LOCAL and REMOTE to be overwriten so that only
the unresolved conflicts are presented to the merge tool. Can be configured per-tool via the mergetool..hideResolved configuration variable. Defaults to false.

Which basically implements what you did with this plugin. Thought you'd want to know 🤷‍♂️

The plugin still helps with the UI setup, where we can easily access local, base & remote with the ...WithHistory variant