ui file updated only when switching to Edit mode

Steps to reproduce:

• create a simple widget application from template
• trigger Open in New Window for one of the files
• open the ui file (Designer mode should open inside the main view)
• if not happened automatically open the ui file inside the additional editor window to see its content
• change a property of the ui file inside the Designer
• check the displayed ui file (1)
• save the content (inside the Designer or the additional window)
• check the displayed ui file (2)
• switch the main view back to Edit mode
• check the displayed ui file (3)

Current behavior:
(1) inside additional window file is marked with an asterisk but no changes to the file's content
(2) inside additional window file is no more marked with an asterisk but no changes to the file's content
(3) ui file inside the main view as well as inside the additional window have the updated content

Expected behavior:
I did not really expect to see the changes to the ui file on the fly but I thought saving the content inside the main view would also update the additional window(s).
If you add a 'normal' header/source file inside an additional window and have it opened several times in other splits or windows content changes will propagated immediately to other instances of this file's editor(s).

Note: I know it's rather unlikely to have a ui file in edit mode open - but anyway.