[Finder] Fix GitIgnore parser when dealing with (sub)directories and take order of lines into account #37560
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The new regex is made per positive
.gitignoreline. Which is a match group followed by a negative lookbehind with all the negations that were on lines after that line. This also fixes some other bugs that didn't match the.gitignorespec and two incorrect tests. I think it's likely that there are more edge cases this PR may not cover, but I haven't found them yet.See the issue for more info.