GFM inconsistency for list after paragraph without blank line

[MattiSG]

Copying github/markup#900 in here:

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The following renders as a list in previews of markdown (.md) files, but renders as a single paragraph on Github pages:

This is a list:
- or is it

Compare https://github.com/Morendil/md-inconsistency/blob/gh-pages/index.md and http://morendil.github.io/md-inconsistency/

This results in errors and frustration when we encourage our users to change or submit content via Github for our site hosted on Github Pages and rendered with Jekyll.

(via @Morendil)

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Opening it here as I sent github/markup#900 to GitHub support, here was their answer through @danayel:

Jekyll is an Open Source project and thus uses a similarly Open Source markdown engine - kramdown.

GitHub itself uses it's own markdown engine, which hasn't been released publically yet.

Getting consistency across the two is something we are interested in and investigating, but for now the best option is to post an issue on the kramdown repository[1] and see if they are able to sort this out on their end.

[gettalong]

There is no spec for GFM and therefore hard to implement it right. Pull requests for adding better compatibility to GFM are welcome.

[gettalong]

This issue is solved by the pull request #358.