rg --debug should output information about ignore files being read.

Currently it outputs something like the following, but it is not clear where the patterns are coming from:

% rg --no-config --debug foo
DEBUG|rg::args|src/args.rs:544: not reading config files because --no-config is present
DEBUG|grep_regex::literal|grep-regex/src/literal.rs:59: literal prefixes detected: Literals { lits: [Complete(luarocks)], limit_size: 250, limit_class: 10 }
DEBUG|globset|globset/src/lib.rs:430: glob converted to regex: Glob { glob: "**/*~", re: "(?-u)^(?:/?|.*/)[^/]*\\~$", opts: GlobOptions { case_insensitive: false, literal_separator: true, backslash_escape: true }, tokens: Tokens([RecursivePrefix, ZeroOrMore, Literal('~')]) }
...

(This information (source filename) could also be displayed with Ignore / Whitelist instances in the debug log later on - or getting assigned a number, which then gets referenced from there (to shortness).)

ripgrep 11.0.2