When switching from wiki editor to the new wysiwyg unsaved changes are lost

Here are the steps to reproduce:

• create or edit a page with syntax xwiki/2.0 using the wiki editor.
• do some changes without saving
• click the WYSIWYG link from the Choose Editor panel to switch the editor

At this moment all the (unsaved) changes made with the wiki editor have been lost. The wysiwyg editor contains the latest saved content.