Crash possibly due to mismatched indents after # fmt: off?

[Zac-HD]

With current latest black, 23.3.0 (compiled: yes):

import black

code = """
if True:
  # fmt: off
  pass
  # fmt: on
  pass
"""
black.format_str(code, mode=black.FileMode())

Traceback (most recent call last):
  File "repro.py", line 10, in <module>
    black.format_str(code, mode=black.FileMode())
  File "src/black/__init__.py", line 1084, in format_str
  File "src/black/__init__.py", line 1089, in _format_str_once
  File "src/black/parsing.py", line 127, in lib2to3_parse
black.parsing.InvalidInput: Cannot parse: 5:0:     pass

This passes if you use four-space indentation. Possibly related to #3458?

[JelleZijlstra]

Duplicate of #3505