When the wiki tag {{code language=“none”}} is used for blocks of code, the spaces at the beginning of a line in this code are converted to something that cannot be interpreted by Linux. Other spaces are official UTF8 spaces.
When the tag {{code language=“xml”}} is used for these blocks of code, all spaces are properly converted to spaces.
Having said that, I propose a solution for preventing issues in the future. My proposal is a button for code (universal) that styles the code in a basic way, without colors. This way all code blocks on XWiki.org will look the same and do not visually distract from the warning, info or error blocks. This way the important warning, info or error blocks will really pop out. Also, don’t forget to emphasize on the contrast with regard to these warning, info or error blocks. The contrast now is too low, which is why a reader disregards the message more easily.
I hope I have been of any help, thanks for all your work on this great piece of software.
Cheers!