Regression: Related documents are not added visually before saving a new document

To reproduce (in GoGreen 3.07.07):

• Create a new product document, give it a title (I did this in the French document tree)
• In the section "related documents", add 2 documents by clicking on the suggestions

Problem: you don't see the documents being added. If you save and close, then open the document for editing again, you do see the 2 added documents, and adding further documents is reflected visually immediately.