Modifying existing environment still attempts to reinstall existing packages

[FriedrichFroebel]

Describe the bug

Trying to install the ocrodjvu with the --force option attempts to build a dependency which is already installed in the virtual environment.

How to reproduce

Running pipx install ocrodjvu fails due to some incompatibilities for python-djvulibre (the PyPI package is broken and I am waiting for a maintainer transfer). Thus I am trying to work with an existing environment:

• /usr/bin/python3 -m venv /home/user/.local/share/pipx/venvs/ocrodjvu
• /home/user/.local/share/pipx/venvs/ocrodjvu/bin/python -m pip --no-input install 'git+https://github.com/FriedrichFroebel/python-djvulibre.git'
• /home/user/.local/share/pipx/venvs/ocrodjvu/bin/python -m pip show python-djvulibre
• pipx install --force --verbose ocrodjvu

This attempts to re-build python-djvulibre (from PyPI) and fails due to known incompatibilities.

Expected behavior

pipx install --force should re-use the existing virtual environment and not attempt to re-install python-djvulibre as stated in the help:

  --force, -f           Modify existing virtual environment and files in PIPX_BIN_DIR and PIPX_MAN_DIR