Dependency get's removed from lock file

[kasium]

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Linux

• Poetry version: 1.1.13

Issue

I have the following in my dependency list

[tool.poetry.dev-dependencies]
diff-cover = {version = "==6.4.4", extras = ["toml"]}

diff-cover depends on setuptools if you run on python < 3.8.
However, a install doesn't install setuptools and it's not listed in the lock file as a depdency of diff-cover

[[package]]
name = "diff-cover"
version = "6.4.4"
description = "Run coverage and linting reports on diffs"
category = "dev"
optional = false
python-versions = ">=3.6.2,<4.0.0"

[package.dependencies]
chardet = ">=3.0.0"
Jinja2 = ">=2.7.1"
pluggy = ">=0.13.1,<2"
Pygments = ">=2.9.0,<3.0.0"
tomli = {version = ">=1.2.1,<2.0.0", optional = true, markers = "extra == \"toml\""}

However, if using poetry 1.2.0b1, the following line will appear in the lock file
setuptools = {version = ">=17.0.0", markers = "python_version < \"3.8\""}

I report this bug even if (maybe) fixed, since 1.1 doesn't include it

[finswimmer]

Hello @kasium,

please see #1584 for the whole story. Especially #1584 (comment) and #1584 (comment).

TL;DR: Poetry haven't locked setuptools explicit before version 1.2 and will do it now.

fin swimmer

[kasium]

thanks a lot!

[github-actions]

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