Even if you have only one git repository, it is useful to ignore the .git directory, because another Eclipse will spend a lot of time looking at the files in it, even if it never needs to do anything with them. In particular, when you perform a large-scale project search, Eclipse will look for all the files in the .git directory, which takes a lot of time and ends up seeing a lot of duplicates (or almost duplicates, older versions of the same file with one found same search query).
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