mergeresult: implement a len() function and use it
In next patch we will start yielding from `getactions()` instead of building and
returning a list. Hence we can no longer rely on that for getting us a length.
Differential Revision: https://phab.mercurial-scm.org/D8880
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true