[ada-wh525]

Updating a source message to correct a spelling mistake currently marks its reused translation as fuzzy, even when the translation remains valid. Disabling fuzzy matching also prevents that translation from being reused.

Add pybabel update --no-fuzzy-flags and the corresponding Catalog.update(no_fuzzy_flags=True) option. This allows translations to be reused without adding a fuzzy flag solely because the message ID changed.

Default behavior remains unchanged. Existing fuzzy flags and checks for changes to singular/plural structure are preserved.

Includes CLI documentation and tests covering singular/plural messages, contexts, existing flags, previous IDs, and PO file updates.

Validation:

• Python 3.14 full suite: 7,962 passed, 7 skipped, 2 xfailed.
• All pre-commit checks passed.
• Source distribution and wheel builds succeeded.

Closes #1030

[chrikrah]

@ada-wh525, reverting catalog.py:991 fails 5 of your 22 cases. Nothing here blocks a merge.

$ python -m pytest -q -p no:cacheprovider tests/messages   # head 08d80b5, git archive export, babel.__file__ from the export, CLDR data from the 2.18.0 wheel, Python 3.12
1 failed, 468 passed   # test_checkers.py::test_4_num_plurals_checkers, UnknownLocaleError from the older CLDR data, not this change

$ python -m pytest -q -p no:cacheprovider tests/messages -k no_fuzzy_flags
22 passed, 1 skipped, 443 deselected

$ sed -i '991s/fuzzy = not no_fuzzy_flags/fuzzy = True/' babel/messages/catalog.py   # only the behavioural line reverted
$ python -m pytest -q -p no:cacheprovider tests/messages -k no_fuzzy_flags
5 failed, 17 passed, 1 skipped, 443 deselected

$ python3 -I -c "from difflib import SequenceMatcher as S; print(S(None, 'enable notifications', 'disable notifications', autojunk=False).ratio())"
0.878   # above get_close_matches cutoff=0.6, catalog.py:44

non-blocking: the flag is run-wide, so "Disable notifications" keeps "Enable" unflagged. Note that in cmdline.rst?

[ada-wh525]

@ada-wh525, reverting catalog.py:991 fails 5 of your 22 cases. Nothing here blocks a merge.

$ python -m pytest -q -p no:cacheprovider tests/messages   # head 08d80b5, git archive export, babel.__file__ from the export, CLDR data from the 2.18.0 wheel, Python 3.12
1 failed, 468 passed   # test_checkers.py::test_4_num_plurals_checkers, UnknownLocaleError from the older CLDR data, not this change

$ python -m pytest -q -p no:cacheprovider tests/messages -k no_fuzzy_flags
22 passed, 1 skipped, 443 deselected

$ sed -i '991s/fuzzy = not no_fuzzy_flags/fuzzy = True/' babel/messages/catalog.py   # only the behavioural line reverted
$ python -m pytest -q -p no:cacheprovider tests/messages -k no_fuzzy_flags
5 failed, 17 passed, 1 skipped, 443 deselected

$ python3 -I -c "from difflib import SequenceMatcher as S; print(S(None, 'enable notifications', 'disable notifications', autojunk=False).ratio())"
0.878   # above get_close_matches cutoff=0.6, catalog.py:44

non-blocking: the flag is run-wide, so "Disable notifications" keeps "Enable" unflagged. Note that in cmdline.rst?

Added a note in ba1aa84 to explain that.