I found a weird behavior with ignoreDotFiles(true): the testsuite of the ExcludeDirectoryFilterIterator passes properly but folder starting with a dot are not ignored.

I found it when using the PHP-CS-Fixer (which calls this method in its DefaultFinder).

mkdir .test
echo "foo     " > .test/foo.php
php-cs-fixer fix . --dry-run

Expected output: no change.
Actual output: .test/foo.php is modified

This is a bit annoying as it means that the fixer messes with the .idea folder holding the PHPStorm metadata.

FYI, I found this bug on Windows. I don't know if it is a platform-specific bug or if it affects Unix environments as well.