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Built-in magic commands do not escape spaces in path #12896

Description

@carlosperate

It does work with shell commands (e.g. !pip instead of %pip), but when using the magic commands spaces are not escaped.

In macOS Big Sur, a brand new virtualenv with spaces in its path:

$ pip list
Package          Version
---------------- -------
appnope          0.1.2  
backcall         0.2.0  
decorator        5.0.6  
ipykernel        5.5.3  
ipython          7.22.0 
ipython-genutils 0.2.0  
jedi             0.18.0 
jupyter-client   6.1.12 
jupyter-core     4.7.1  
parso            0.8.2  
pexpect          4.8.0  
pickleshare      0.7.5  
pip              19.2.3 
prompt-toolkit   3.0.18 
ptyprocess       0.7.0  
Pygments         2.8.1  
PyQt5            5.15.4 
PyQt5-Qt5        5.15.2 
PyQt5-sip        12.8.1 
python-dateutil  2.8.1  
pyzmq            22.0.3 
qtconsole        5.0.3  
QtPy             1.9.0  
setuptools       41.2.0 
six              1.15.0 
tornado          6.1    
traitlets        5.0.5  
wcwidth          0.2.5  

$ ipython
Python 3.8.2 (default, Jun  2 2020, 13:57:42) 
Type 'copyright', 'credits' or 'license' for more information
IPython 7.22.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: !pip --version
pip 19.2.3 from /Users/microbit-carlos/workspace/deleteme/really-delete/path with spaces/.venv/lib/python3.8/site-packages/pip (python 3.8)

In [2]: %pip --version
zsh:1: no such file or directory: /Users/microbit-carlos/workspace/deleteme/really-delete/path
Note: you may need to restart the kernel to use updated packages.

In [3]: pip --version
zsh:1: no such file or directory: /Users/microbit-carlos/workspace/deleteme/really-delete/path
Note: you may need to restart the kernel to use updated packages.

Closest open issue i've found is this one, but in that it looks like the spaces are escaped incorrectly? #11138

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