Missing confirmation dialog when leaving editor after editing a select property

Reproduction steps:

• Create an xclass containing a boolean field and a static list with values "Foo|Bar|Buz" and a select input type
• Create a page with an xobject of the xclass and save
• Go to the object editor to edit the created xobject and switch the static list property value
• Click on a link in the UI

Expected result:

• a confirmation dialog is displayed since there was a change that hasn't been saved

Obtained result:

• no confirmation dialog is displayed, the user leave the editor without saving

Note that the same behaviour happened in case of changing the boolean value in the xobject editor.