Locked hash of VCS dependency with extras is ignored when installing

[radoering]

• 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:
• Poetry version:
• Link of a Gist with the contents of your pyproject.toml file:

Issue

When running poetry install the resolved_reference of a locked vcs dependency (referencing just a branch in pyproject.toml) is ignored and another ref might be installed.

Repro: https://github.com/bryanforbes/poetry-no-git-branch-locking

• without-extras works as expected
• with-extras installs another ref

[github-actions]

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