Preserve timestamps for existing destination directories #1059
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Summary
When copying or moving directories with "Preserve all timestamps" enabled, timestamps are restored only for newly created destination directories.
If the destination directory already exists, its timestamps are currently left unchanged, even when it corresponds to a source directory being copied. This breaks the expected behavior of the option.
Queue existing destination directories for timestamp restoration in the same way as newly created ones, so their timestamps are restored after copy completion.
References
Fixes #460