[1.2.0a2] Running poetry remove uninstalls all default dependencies.

[onerandomusername]

• 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: Raspberry pi OS, pi 4
• Poetry version: 1.2.0a2
• Link of a Gist with the contents of your pyproject.toml file: https://github.com/discord-modmail/modmail/blob/3d56fd9fdb140f1232f64d2c4eda8fb5c9adabe9/pyproject.toml (Entire project as well)

Issue

>>> poetry add python-dotenv
Using version ^0.19.0 for python-dotenv

Updating dependencies
Resolving dependencies... (31.9s)

Writing lock file

Package operations: 0 installs, 1 update, 0 removals

  • Updating discord.py (2.0.0a3453+g58ca9e99 58ca9e9 -> 2.0.0a3466+g6e6c8a7b 6e6c8a7)
>>> poetry remove python-dotenv
Updating dependencies
Resolving dependencies... (2.2s)

Writing lock file

Package operations: 0 installs, 0 updates, 20 removals

  • Removing aiodns (3.0.0)
  • Removing aiohttp (3.7.4.post0)
  • Removing arrow (1.1.1)
  • Removing async-timeout (3.0.1)
  • Removing brotlipy (0.7.0)
  • Removing cchardet (2.1.7)
  • Removing cffi (1.14.6)
  • Removing chardet (4.0.0)
  • Removing coloredlogs (15.0.1)
  • Removing discord.py (2.0.0a3466+g6e6c8a7b 6e6c8a7)
  • Removing environs (9.3.3)
  • Removing humanfriendly (9.2)
  • Removing marshmallow (3.13.0)
  • Removing multidict (5.1.0)
  • Removing pycares (4.0.0)
  • Removing pycparser (2.20)
  • Removing pydantic (1.8.2)
  • Removing python-dateutil (2.8.2)
  • Removing python-dotenv (0.19.0)
  • Removing yarl (1.6.3)

This is just after running poetry run task export, which expanded, is the following:

echo 'Exporting installed packages to requirements.txt.\n\
This task automatically relocks the lock file using "poetry lock --no-update"' && \
poetry lock --no-update && \
echo '# Do not manually edit.\n# Generate with "poetry run task export"\n' > requirements.txt && \
echo "Exporting..." && \
poetry export --without-hashes >> requirements.txt && \
echo "Done exporting."

Please note, this is in the toml file and is a multiline string, which needed to be escaped.

Desired Behavior

Poetry should not uninstall all default dependencies when removing one dependency from a project.

[jleclanche]

Confirming this behaviour on 1.2.0a2.

[finswimmer]

This is duplicated by #4632 and fixed by python-poetry/poetry-core#220.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.