[Hugohong258]

Type of changes

• Bug fix

Checklist

• I've run the latest black with default args on new code. (Checked with black 22.3.0, the version pinned in the project configuration.)
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @PyFilesystem/maintainers may be pedantic in the code review.

Description

Fixes #558. Moving a file within the same filesystem with preserve_time=True can raise ResourceNotFound after the original path has already been renamed. MemoryFS has the same problem when moving a directory.

A successful filesystem rename retains the file's modification time, and MemoryFS moves the existing entry with its timestamps intact. Avoid reading the old path in those cases; the copy-based fallback still copies the timestamp before removing the source. Regression tests cover direct and helper moves, destination replacement, and a MemoryFS directory with a child.

Thanks to @mj0nez for reporting the bug and the earlier investigation in #559.

Validation

• Windows, CPython 3.9.25: python -m pytest tests/test_move.py -q (26 passed; 10 existing deprecation warnings).
• Black 22.3.0 --check and the project flake8 configuration passed on the three changed Python files.
• Linux, CPython 3.14.4: the same module had 20 passing tests and 6 failures in existing tests using the removed unittest.TestCase.assertEquals alias; the full test matrix was not run.