Improve validation of XHTML storage format to prevent content from being placed outside of layout sections

A customer has observed an issue where parts of pages are unable to be edited in the Confluence Editor. Upon closer inspection, it was found that the un-editable content are outside of the layout sections (enclosed by dotted lines) on the pages.

It is unknown how the content got this way, but a bad copy/paste with incomplete XHTML is suspected.

As this can render pages un-editable, it would be ideal if we can improve the validation of our storage format to prevent situations like this from happening, as the content should never be outside of a layout section if there's a layout selected.

Workarounds:

• Revert to a previous version before the page became broken
• XHTML-savvy users can use the Confluence Source Editor to modify the XHTML and enclose the problematic sections into a layout macro.