tags: add safety check for len(record) while reading hgtagsfnodescache
I am trying to fix a breakage where somehow we end up getting a node of 12
length from `getfnode()`. Understanding the hgtagsfnodescache code, it seems
highly unlikely that it can happen unless one of `mctx.readfast().get()` or
`ctx.filenode()` is returning a node of 12 length.
For safety, I think it's better to add a check to make sure that record which we
are parsing is of same length we are expecting otherwise we consider that as
invalid record.
Differential Revision: https://phab.mercurial-scm.org/D9169
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true