The browser's Back button doesn't restore unsaved changes to the edited content

Here are the steps to reproduce:

• edit a page in WYSIWYG mode
• change the content without saving (add or remove text)
• change the title of the page without saving (add or remove text)
• click the XWiki logo from the top-left corner of the page while still in edit mode;
• as a result you should be taken to the dashboard page
• click the back button to comeback to the edited page

Notice that the title changes are kept while the content changes are lost.