User mention limit: clarify the error message?

[Moin]

@yrodiere

We could talk of Discourse automatically detecting source code and suggesting to format it

There is a #theme-component doing that

Unformatted Code Detector theme component

Links GitHub repo Live demo Installation instructions Usage [Unformatted Code Detector] After installation, users posting unformatted code will see a warning message instructing them how to format it correctly. Sensitivity and whether it detects HTML are configurable via theme settings. Debugging If you receive a warning for a post which doesn’t include any text, you can print debug information by opening the browser JS console, and typing debugUnformattedCodeDetector() Enter. This will…