Add .gitignore support to --watch about kaocha HOT 3 CLOSED

Another option would be to use git ls-files (https://git-scm.com/docs/git-ls-files). Then you would only need to parse a more straightforward list of files, but more care would be needed in invalidating the list. One other thing to remember which I didn’t see at first glance in some of the code is that you need to look for gitignores up and down the tree

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In theory, we could make this broader than .gitignore. I don't want to add extra syntaxes to the original implementation, but we can get support for other ignores almost for free.

• Ripgrep (rg) and the Silver Searcher (Ag) use .ignore files, which I think uses the same syntax.
• I think Mercurial ignore files with syntax: glob use a very similar syntax, but I'm not sure it's the same.

That being said, we don't want to use ignore files indiscriminately. It's very plausible someone would put their tests directory in .dockerignore, for example.

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This was closed by #189.

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