[issue25671] Fix venv activate.fish to maintain $status

[Nathan West]

Nathan West added the comment:

Fixed an issue where fish_prompt was returning before calling _old_fish_prompt

----------
Added file: http://bugs.python.org/file41103/patch.diff

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25671>
_______________________________________