Pasted URL getting changed when post is submitted

[AnnaTomanek]

Pasted URL: https://ckeditor.com/docs/ckeditor4/latest/guide/dev_integration.html becomes https://ckeditor.com/docs/ckeditor4/latest/guide/dev\_integration.html

[AnnaTomanek]

Another one: https://docs.google.com/document/d/1JXHcGjpCnAMJk2w2a_FwfqA0w5rbgdcL-Eu_3_zKTtk/edit#heading=h.k1drv7mozlsw got transformed to https://docs.google.com/document/d/1JXHcGjpCnAMJk2w2a\_FwfqA0w5rbgdcL-Eu\_3\_zKTtk/edit#

[fredck]

This affects emojis as well. For example, the :full_moon: emoji is saved as :full\_moon:. But for emojis, GitHub doesn't make a problem, while the same is not true for urls.

The fact is that this is a GitHub bug 😱 (maybe by design?)

The backslash is used to escape characters in markdown. In the issue reported, the underscore is being escaped, because it is the markup for italic.

[fredck]

Upstream issue:
domchristie/turndown-plugin-gfm#22

[fredck]

Fix merged into ckeditor/ckeditor5-markdown-gfm#29 with add4f7.