Ensure copy filter fn is not called more than needed #883
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Fixes #809
We need to check filter before creating a parent directory for
dest, in case the filter cancels the entire operation. After creating the parent (if needed), we were calling a function that rechecked the filter, which wasn't needed, and resulted in the filter fn being called twice at the root level.With these changes, we should possibly consider renaming some functions, as it doesn't seem to make much sense anymore.