This event consists of a single serialized map containing a property
+change (string)+ which indicates the type of the change ("focus", "init",
-"empty", "urgent", "reload", "rename", "restored"). A +current (object)+
-property will be present with the affected workspace whenever the type of event
-affects a workspace (otherwise, it will be +null).
+"empty", "urgent", "reload", "rename", "restored", "move"). A
++current (object)+ property will be present with the affected workspace
+whenever the type of event affects a workspace (otherwise, it will be +null).
When the change is "focus", an +old (object)+ property will be present with the
previous workspace. When the first switch occurs (when i3 focuses the