Temp file paths can be inconsistent with debugpy

[kycutler]

The user directory on my Windows machine is C:\Users\kycutler.NORTHAMERICA. However the temporary file location returned by tempfile.gettempdir() is shortened to C:\Users\KYCUTL~1.NOR\AppData\Local\Temp. Thus the shortened version is used in tmpFilePrefix and results from dumpCell:

However, debugpy converts file paths to their long form, so the temp file paths are different:

This causes issues in the frontend since we can not simply check for equality between the paths returned from debugpy and those returned from dumpCell or constructed using tmpFilePrefix.

[kycutler]

I have also witnessed some issues with inconsistent path separators in some environments.

Notice the mix of forward- and back-slashes here:

But the paths received from debugpy (e.g. stacktrace) are all back slashes:

It's simple enough to normalize these in the frontend, but ideally that shouldn't be necessary.

These are from a fresh conda environment using conda create -n envname ipykernel notebook. I'm not sure why the path separators are different from in my original post, other than using different versions. Whoops, it looks like I was actually connected to xpython in the original post... both have the short path issue but it looks like only ipython has the inconsistent path separators as well.