Avoid re-saving documents during batch import when nothing has been modified

The use case : A user makes an AWM in order to create structured pages. Using the Batch import application the user make an initial import of some pages from a CSV file. After that, the user updates some rows of the CSV file and re-import the CSV file (Note that : the Batch import is configured to update the documents when they already exists).

Expected result : During the 2nd batch import, If the data of a given existing page was not modified on the CSV file, the page is not saved and no entry is added to the history of the page.
Actual result : A new entry is added to the history of the page even if no changes have been made to the document.