incorrect gitignore behaviour

[Kartiku]

Steps

1. Clone nim project git clone https://github.com/nim-lang/Nim.git
2. In nim folder run rg uint64. It gives no results which is incorrect. Silver searcher gives correct results
3. Used git check-ignore lib\system.nim to verify git doesn't ignore the file
4. rg --debug output here. Lib folder is being ignored

Using 0.7.1 release from here

[lambda]

That is a strange .gitignore. Ignoring everything with * then unignoring all directories with !**/, and all files with extensions with !*.*, and finally listing a bunch of more specific ignore rules.

Anyhow, regardless of how strange a gitignore it is, looks like the issue is with the conversion of !**/ into **/**/* before converting it into a regex. That looks like a clear bug.

[lambda]

This should be fixed by PR #652, but that's currently held up by an odd, seemingly unrelated test failure on the Mac build. Should be merged once we've sorted that out.