For a medium-to-large code blocks, it’s very impractical to type them with alignment, as people usually do in the code, because a non-monospace is used.
This is a feature request to automatically use monospace font inside the code blocks where we edit the post content.
you mean something like this ?
if(expression)
{
statement;
statement;
}
else
{
statement;
statement;
}
Hm, not sure what you’re asking about exactly?
He wants the font to be different in the composer, not just in the cooked post.
This is great. However, it has been said multiple times that the Discourse team is not going to support a wysiwyg editor officially any time soon, and any non-official plugins in this area are very prone to issues and are hard to keep up to date. I wouldn’t use a non-official plugin in the community I’m launching.
… which is confirmed by the plugin’s author’s recent post:
Which is why I pointed you to that plugin 
Another work-around would be to just use CSS to make the composer be fixed-width font. If you have a code-heavy community, that would make sense.
Is it even possible to change the font-family in just a subset of a text area content ?
Why would you even type a medium-to-large code snippet in the composer? That’s what text editors are for.
Type your code in the text editor of your choice (Atom, Visual Studio, Sublime text…etc.), then copy it to the composer in Discourse.
Note that I’m not asking for opinions or advice about why I should not do what I want to do.
I’m asking for a technical solution to a very particular problem I described above.
I don’t think it’s possible to have a text area in a browser have multiple different font-family for different lines of content. So considering Discourse composer is text-area based, and this isn’t something we plan to change in the near future I don’t see how to address your feature request.
The best you could do is set the whole composer to use a mono spaced font using CSS. Maybe even restrict that change to a specific category or tag.
Done that, thanks. Working great, same as when composing wiki entries in Github - they too seem to have mono font in the editor.