Oscar Renalias

TinyMCE, for some reason, likes to convert to and from newline characters '\n' into <br/>. This has the undesired effect of breaking formatting within <pre> tags, which is very annoying if you use them to wrap around source code.

The solution, with a small cleanup plugin:

fixNewLines = function(type, content) 
{
  switch (type) {
   case "get_from_editor":
     content = content.replace(/<br\s*\/>/gi, "\n");
     break;
   case "insert_to_editor":
     break;
   }

  return content;
}

In order to have the plugin loaded, add the following to the code that creates the TinyMCE editor:

tinyMCE.init({
  ...
  cleanup_callback: fixNewLines,
  ...
}); 

Just make sure that the cleanup plugin is loaded before the TinyMCE object is instantiated.

This idea isn't mine, I only improved the regexp, but I cannot find the link where I saw it...