Use a temp buffer instead of find-file
This improves performance and reduces side effects from running find-file. This also removes the need to kill the buffer after we are done using it, and dosen't pop it up even temporarily.
I needed this because for some reason, I'm getting errors when using
find-file
in batch mode (and I run quelpa in CI), and this seems
like a better idea either way.
Let me know if you need any adjustments.