Path name with spaces converted to "%20" by Jupyter Notebook was not valid for saving #6067
Description
Environment
Jupyter Notebook version: 6.0.1
Conda version: 4.8.2
Python version: 3.7.10
Platform: Mac OS version 10.15.3
Browser Version: Google Chrome - Version 90.0.4430.212 (Official Build) (x86_64)
Description
I have encountered this issue when I tried to save a Notebook file in the subpath of the current path which has spaces in its name - the spaces were automatically converted to "%20", but the file failed to be saved without any changes to the original pathname, except for adding a subpath at the end. Removing the "%20" markers and added the spaces back did work though.