https://sw.kovidgoyal.net/kitty/build/#notes-for-linux-macos-packagers recommends to split kitty into three packages with kitty-shell-integration being the one that includes some files useful for the shell integration. We already use kitty.terminfo in Nixpkgs instead of kitty-terminfo but we can't use kitty.shell-integration instead of kitty-shell-integration because shell-integration is not a valid shell variable name. I named it kitty.shell_integration instead. This package can then be used by a future kitty nixos module that still needs to be created. Without this commit, kitty would modify the user's ~/.bashrc when using bash.
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