black.toml

copies-rust: split up combine_changeset_copies function into a struct

… such that each iteration of its former loop is now a method call,
with the caller driving the loop.

This entirely removes the need for the `DataHolder` hack:
the method now takes a `ChangedFiles<'_>` parameter that borrows
a bytes buffer that can be owned by the caller’s stack frame,
just for the duration of that call.

Differential Revision: https://phab.mercurial-scm.org/D9683

[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true