DocNav - unchanged documents are "new" or "updated"
When a new version of Vivado is released I like to know what's changed. One way to find out is to download the latest User Guides - the ones that DocNav says have been updated. For 2015.4 I have downloaded some of these only to find they haven't changed. For example in UG1118 - Creating and Packaging Custom IP - the revision History says "Released with Vivado Design Suite 2015.4 without changes from the previous version". Another example is UG904 - Implementation. This seems pointless and unhelpful. If it really is necessary to "update" documents in this way would it be possible for DocNav to show where this is the case? Or to indicate that an updated document has only superficial changes?
Also, the Release Notes for 2015.4 seem to repeat those for 2015.3 - compare pages 7 and 82, for example.