If the text formatting is "none", Meta characters in URLs are escaped twice.

For example,

http://foo/bar.cgi&query=bazo

is formatted as:

http://foo/bar.cgi&query=baz

This problem is introduced by Redmine::WikiFormatting::NullFormatter#to_html (in lib/redmine/wiki_formatting.rb):

def to_html(*args)
  t = CGI::escapeHTML(@text)
  auto_link!(t)
  auto_mailto!(t)
  simple_format(t, {}, :sanitize => false)
end

Meta characters in URLs of the @text are escaped by both CGI::escapeHTML() and auto_link!() . So,

&

becomes

&

---

$ RAILS_ENV=production rake about

About your application's environment
Ruby version              2.0.0 (amd64-freebsd8)
RubyGems version          1.8.25
Rack version              1.4
Rails version             3.2.13
Active Record version     3.2.13
Action Pack version       3.2.13
Active Resource version   3.2.13
Action Mailer version     3.2.13
Active Support version    3.2.13
Middleware                Rack::Cache, 
 ActionDispatch::Static, 
 Rack::Lock, 
 #,
 Rack::Runtime,
 Rack::MethodOverride,
 ActionDispatch::RequestId,
 Rails::Rack::Logger,
 ActionDispatch::ShowExceptions,
 ActionDispatch::DebugExceptions,
 ActionDispatch::RemoteIp,
 ActionDispatch::Callbacks,
 ActiveRecord::ConnectionAdapters::ConnectionManagement,
 ActiveRecord::QueryCache, ActionDispatch::Cookies,
 ActionDispatch::Session::CookieStore,
 ActionDispatch::Flash,
 ActionDispatch::ParamsParser,
 ActionDispatch::Head, Rack::ConditionalGet, Rack::ETag,
 ActionDispatch::BestStandardsSupport,
 OpenIdAuthentication
Application root          (snip)/redmine-2.3.1
Environment               production
Database adapter          sqlite3
Database schema version   20130217094251