PropertyFieldPlugin always redraws when receiving Jcr events and field.isOrdered is true

Reproduction path:

• create a new document type X
• add a 'Formatted text' field
• mark it as multiple
• mark it as ordered
• save document type
• create a new document of type X
• add two Xinha fields
• click field one and add some text
• immediately click field two

Result: An error occurs. This is because the autosave call of the first Xinha field triggers a redraw in the PropertyFieldPlugin because it is marked as ordered, see org/hippoecm/frontend/editor/plugins/field/PropertyFieldPlugin.java:107

The autosave call always result in an empty ajax response.