git: is_tracked: use ls_files instead of walking the index #3677
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Current implementation doesn't work with directories, which results in
hard-to-debug bugs like #3561. The bug that made us walk through index
manually is now fixed in gitpython, so we can simply use
ls_files
fromnow on. Added some tests to prevent this from happening in the future.
Fixes #3561
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Thank you for the contribution - we'll try to review it as soon as possible. 🙏