Fix Jupyter Panel Preview in Windows

[hoxbro]

Fixes #4819

The path string was not raw, which meant on Windows, the path would give a Unicode error. I also added more logging if the msg_type is an error.

[MarcSkovMadsen]

I'm so happy for

• the fix
• that it was not me speaking out very loudly about a problem that was on my side 😄

Thanks a lot @hoxbro . My hero 🦸

[codecov]

Codecov Report

Merging #4826 (3d980c4) into main (456334e) will decrease coverage by 0.81%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #4826      +/-   ##
==========================================
- Coverage   83.40%   82.59%   -0.81%     
==========================================
  Files         269      269              
  Lines       37986    37975      -11     
==========================================
- Hits        31681    31367     -314     
- Misses       6305     6608     +303     

Flag	Coverage Δ
ui-tests	40.80% <0.00%> (+0.01%)	⬆️
unitexamples-tests	72.04% <0.00%> (-1.32%)	⬇️

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Impacted Files	Coverage Δ
panel/io/jupyter_server_extension.py	0.00% <0.00%> (ø)

... and 30 files with indirect coverage changes

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[philippjfr]

Thank you both, glad we were able to track this down!

[MarcSkovMadsen]

I tried the fix locally and can confirm it works for me