Underscores in Ace Editor are not rendered with Ace default CSS

[davidomarf]

I took a look to the Functions page and found this:

Being the first time I looked at Rust code, I assumed it was possible to define functions using a whitespace in the name.

When I realized it wasn't true, I tried to open a issue to correct the content of the code and replace the whitespaces in the functions for underscores, however, I noted that they were actually there, but not rendered.

---

font attribute

This is the default style for Ace blocks:

When supressing the font attribute in .ace_editor, the underscore renders properly:

WhatFont reports that the font used is monospace:

However, when I force monospace to be the chosen font, it works properly:

I checked for the installed functions in my OS. This is the result:

$ fc-list | grep -i "Monaco"                                                                                                                               
## nothing

$ fc-list | grep -i "Menlo"          
## nothing

$ fc-list | grep -i "Ubuntu"         
## nothing

$ fc-list | grep -i "Consolas"       
## nothing

$ fc-list | grep -i "source-code-pro"
/usr/share/fonts/adobe-source-code-pro/SourceCodeVariable-Roman.otf: Source Code Variable:style=Light
## ... several more lines

'source-code-pro', monospace

Apparently, that's the problematic combination. If I only leave source-code-pro in the list of fonts to use, it defaults to serif:

'Source Code Pro'

If I replace 'source-code-pro' with 'Source Code Pro', it renders properly:

Proposed solutions

a. Replace 'source-code-pro' with 'Source Code Pro' with a script (since it's not provided and generated from ace.js script).
b. Add !important to code { font-family } in general.css

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If needed or relevant, this is my environment:
OS: Manjaro 18.1.0
Chrome: 77.0.3865.90

[davidomarf]

After checking some of the files in this repository, I realised that the appropiate repository should be rust-lang-nursery/mdBook.

I'm moving this there, and closing as it feels appropiate.