Redmine

This problem is due to Redmine::SyntaxHighlighting::CodeRay::language_supported?.

def language_supported?(language)
  ::CodeRay::Scanners.list.include?(language.to_s.downcase.to_sym)
rescue
  false
end

p language
# => "javascript" 

p ::CodeRay::Scanners.list
# => [:c, :clojure, ... :java_script, ... :xml, :yaml]

p ::CodeRay::Scanners.list.include?(language.to_s.downcase.to_sym)
# => false

Here is a quick and dirty workaround (which I haven't actually tested yet) for users who are suffering from this regression and cannot wait for a released fix:

Index: lib/redmine/syntax_highlighting.rb
===================================================================
--- lib/redmine/syntax_highlighting.rb    (revision 16543)
+++ lib/redmine/syntax_highlighting.rb    (working copy)
@@ -70,7 +70,8 @@
         end

         def language_supported?(language)
-          ::CodeRay::Scanners.list.include?(language.to_s.downcase.to_sym)
+          coderay_aliases = [:'c++', :cplusplus, :ecmascript, :ecma_script, :rhtml, :eruby, :irb, :javascript, :js, :pascal, :patch, :plain, :plaintext, :xhtml, :yml]
+          ::CodeRay::Scanners.list.include?(language.to_s.downcase.to_sym) || coderay_aliases.include?(language.to_s.downcase.to_sym)
         rescue
           false
         end

Thanks for the patch. I had indeed missed the alias names for Coderay.

Looks good to me!