feature-specific deps installed inside pixi shell only available after restarting shell

[moritzwilksch]

Checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pixi, using pixi --version.

Reproducible example

(running this in a fish shell)

➜  example git:(main) ✗ pixi init && pixi add python
➜  example git:(main) ✗ pixi add -f feat1 polars
➜  example git:(main) ✗ nvim pixi.toml  # add env1 = ["feat1"]
➜  example git:(main) ✗ pixi shell -e env1
(example:env1) ➜  example git:(main) ✗ python
Python 3.12.3 | packaged by conda-forge | (main, Apr 15 2024, 18:35:20) [Clang 16.0.6 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import polars  # works
(example:env1) ➜  example git:(main) ✗ pixi add -f feat1 pandas  # still in the pixi shell
✔ Added pandas
(example:env1) ➜  example git:(main) ✗ python
Python 3.12.3 | packaged by conda-forge | (main, Apr 15 2024, 18:35:20) [Clang 16.0.6 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'pandas'
>>>
(example:env1) ➜  example git:(main) ✗  # CTRL+D
➜  example git:(main) ✗ pixi shell -e env1
(example:env1) ➜  example git:(main) ✗ python
Python 3.12.3 | packaged by conda-forge | (main, Apr 15 2024, 18:35:20) [Clang 16.0.6 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas  # works

Issue description

When adding dependencies to a specific feature from inside a pixi shell running in an environment using that feature, the installed dependency is not available. One has to quit the pixi shell and restart it for it to be usable.

This does not happen when adding deps to the default environment from inside the default shell.

Expected behavior

Just like with the default environment, dependencies should be available immediately after a pixi add without having to restart the pixi shell.

[niemiaszek]

Ah, I guess it is what got me confused lately. Same for me

[baszalmstra]

I think this is a duplicate of #1018

[ruben-arts]

Closed in favor of #1018