🐛 FIX: Spurious newline in generated literal_block nodes

[cpitclaudel]

Closes #407. The details are in the original bug report, but the long story short is that Docutils already adds a newline to its <pre> blocks, so we don't need one more. I opted to fix all literal_blocks, but the most important ones are the ones in create_highlighted_code_block.

[chrisjsewell]

Cheers @cpitclaudel, I will have a look probably Monday now

[codecov]

Codecov Report

Merging #541 (45c32c8) into master (8f53a0b) will decrease coverage by 0.06%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #541      +/-   ##
==========================================
- Coverage   89.78%   89.72%   -0.07%     
==========================================
  Files          16       16              
  Lines        2104     2111       +7     
==========================================
+ Hits         1889     1894       +5     
- Misses        215      217       +2     

Flag	Coverage Δ
pytests	89.72% <83.33%> (-0.07%)	⬇️

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Impacted Files	Coverage Δ
myst_parser/docutils_renderer.py	91.86% <83.33%> (+0.07%)	⬆️
myst_parser/mocking.py	85.43% <0.00%> (-0.79%)	⬇️

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[chrisjsewell]

Thanks @cpitclaudel this requires fixes for a number of the regression tests (if you didn't know you can run pytest --force-regen

My question would be though; should the behaviour be the same for docutils and sphinx? i.e.does the sphinx builder also require this new line removal?