Before, would save view section itself (including root element). But
branding distribution (and thus editability) are set on the last
programmatic root, thus the root element may well be generated
e.g. <span t-att-foo> will define the span itself as editable.
Saving this would remove the programmatic content on the node, and
thus break the view section altogether.
Fix the issue by only saving the root's content in the previous root.
bzr revid: xmo@openerp.com-20131217112034-nbxbg919cffv4w51
Xavier Morel