Allow latex_escape to work in a Rails 2.2+ environment

Since Rails 2.2 aliases l() as localize(), this leads to conflicts with
RTeX's aliasing of l() as latex_escape(). To work around the conflict,
this patch forces latex_escape to pass control on to localize if rtex is
not doing the rendering.

Signed-off-by: Bruce Williams <bruce@codefluency.com>

lib/rtex/framework/rails.rb

@@ -55,8 +55,15 @@ def render_with_rtex(options=nil, *args, &block)
 
       module HelperMethods
         # Similar to h()
-        def latex_escape(s)
-          RTeX::Document.escape(s)
+        def latex_escape(*args)
+          # Since Rails' I18n implementation aliases l() to localize(), LaTeX
+          # escaping should only be done if RTeX is doing the rendering.
+          # Otherwise, control should be be passed to localize().
+          if Thread.current[:_rendering_rtex]
+            RTeX::Document.escape(*args)
+          else
+            localize(*args)
+          end
         end
         alias :l :latex_escape
       end