WIP: Fix pyenv local venv

The virtualenvs.prefer-active-python flag is currently not
working for me; instead of selecting the local env, I get they
poetry venv.

This change resolves the problem for me.

FIXES: python-poetry#8119

Author: paultiplady

Diff for: src/poetry/utils/env/env_manager.py

@@ -237,6 +237,12 @@ def get(self, reload: bool = False) -> Env:
         prefer_active_python = self._poetry.config.get(
             "virtualenvs.prefer-active-python"
         )
+        if prefer_active_python:
+            executable = self._detect_active_python()
+            bin_dir = executable.parent
+            path = bin_dir.parent
+            return VirtualEnv(path, Path(executable.name))
+
         python_minor = self.get_python_version(
             precision=2, prefer_active_python=prefer_active_python, io=self._io
         ).to_string()