Fired when one of the editables loses focus.
Introduced by FocusObserver.
FocusObserver
Note that because FocusObserver is attached by the EditingView this event is available by default.
EditingView
args : tuple
module:engine/view/observer/focusobserver~ViewDocumentBlurEvent#args
name : 'blur'
module:engine/view/observer/focusobserver~ViewDocumentBlurEvent#name
object