If a Javascript file loaded through ResourceLoader contains the text strings " ", " ", or " ", these will be changed to a raw space or non-breaking space. This causes a problem in [[en:MediaWiki:Gadget-charinsert.js]], as that gadget wants to effectively do document.createTextNode(' ') to include the literal string " " in the charinsert box.

The source of the replacement is in includes/cache/MessageCache.php, at the end of get(). Since that's in such a low-level function, I don't know what the consequences of changing it might be for other messages. Another possibility might be to have ResourceLoader use getMsgFromNamespace instead to avoid the problematic replacement.

Version: 1.17.x
Severity: major