So, I thought what I'd like to do is to get vim 9.0 back (with no patches) and see if that worked. Then, if the plugin continues to misbehave, then I'd like to get vim 8.0. Once I have a version of vim where the plugin works I'd like to use git bisect to find the problematic patch. I realize that I'd have to learn more git. So, how to get vim 9.0, vim 8.0?
If you're ok with compiling vim then: (if you're sure v9.0.0000
has no issues, if it has, choose older version tag)
1. git clone g...@github.com:vim/vim.git
2. git bisect start
3. git bisect bad
4. git bisect good v9.0.0000
build vim, check your plugin if it is bad: `git bisect bad`, if it is good: `git bisect good`
continue until commit that breaks your plugin is found.