If you have nvim-notify and nvim-lsp-notify enabled, when you try to diff two files that have an LSP configuration available, it breaks the diffmode.

To reproduce:

1. Configure LSP for your language of choice
2. Produce two files foo.mylang and bar.mylang with different content
3. nvim -d foo.mylang bar.mylang -> doesn't work
4. Comment out require("lsp-notify").setup() from your config
5. nvim -d foo.mylang bar.mylang -> works again