stop tracking focus state in window{}

window.js

@@ -1,25 +1,23 @@
 const create = id => ({
   id,
   workspace: null,
-  shown: false,
-  focused: false
+  shown: false
 })
 
 const show = window => {
+  if (!window) return
   global.X.MapWindow(window.id)
   window.shown = true
 }
 
 const hide = window => {
+  if (!window) return
   global.X.UnmapWindow(window.id)
   window.shown = false
 }
 
 const focus = window => {
   global.X.SetInputFocus(window.id)
-  // todo: how does this get unset
-  // is it even the job of the window to maintain this?
-  window.focused = true
 }
 
 export {create, show, hide, focus}