Is there some way to run whatever you copy to the 'clipboard' through some sort of filter? Ideally to strip out the trailing newline from something you copy, so that it doesn't auto-run in the terminal?
This is what it looks like when I copy the test in question, and I sometimes forget this is a new line.
So your proposed exsheets-git would conflict with texlive-latexextra (and it should be in the conflicts array). So you could not have them both properly installed at the same time. If you want the newest exsheets, you could make a aur package with all the newest components of texlive-latexextra. Then it could conflict with and provide that package, so you'd install your new