Removal of _unicodefun from the recently 8.1.0 breaks dependees

[kilemensi]

The recently released 8.1.0 seem to have removed _unicodefun. This causes dependees that expect _unicodefun to be there to break.

Any code that uses the current version of black will break. See log from our CI build below:

 Traceback (most recent call last):
  File "/root/.cache/pre-commit/repoxd97m0e9/py_env-python3/bin/black", line 8, in <module>
    sys.exit(patched_main())
  File "/root/.cache/pre-commit/repoxd97m0e9/py_env-python3/lib/python3.10/site-packages/black/__init__.py", line 1423, in patched_main
    patch_click()
  File "/root/.cache/pre-commit/repoxd97m0e9/py_env-python3/lib/python3.10/site-packages/black/__init__.py", line 1409, in patch_click
    from click import _unicodefun
ImportError: cannot import name '_unicodefun' from 'click' (/root/.cache/pre-commit/repoxd97m0e9/py_env-python3/lib/python3.10/site-packages/click/__init__.py)

Also this issue on distributed is caused by the same bug.

Going from 8.0.4 to 8.1.0 being a minor release upgrade, I expect _unicodefun to be there.

Environment:

• Python version: 3.10
• Click version: 8.1.0

[roskakori]

This also breaks spaCy (#10564).

[leiserfg]

Codespell is also affected.

[graingert]

_unicodefun was removed here 0ccada0 due to #2198 see:

click/CHANGES.rst

Lines 24 to 26 in f467dd3

	- Rely on :pep:`538` and :pep:`540` to handle selecting UTF-8 encoding
	instead of ASCII. Click's locale encoding detection is removed.
	:issue:`2198`

[davidism]

Duplicate of #2225