Changes don't get saved when in plaintext mode

Since the fix for #252095, changes made in plain text mode don't get saved. This is because they are overwritten by the contents of the rte.

Because this seems to be an error in the original yui-editor API, I will report it there as well.

A possible workaround: Use the submit handler I proposed in #252095, with an additional if (plaintextState = 'on') check. No, I didn't make a mistake here by writing 'on' in stead of 'off'. The values got mixed up in yui_editor.js. I tested this for Drupal 6 in both Firefox and IE7 and it works as expected.

Gertjan