move cursor position to the end of contenteditable div after model is changed

src/radians/contenteditable.coffee

@@ -25,6 +25,18 @@ angular.module('radians.contenteditable', [])
     ctrl.$render = ->
       old_render() if old_render != null # old_render? leads to linted js
       elmt.html ctrl.$viewValue
+      # move cursor to the end
+      el = elmt.get(0)
+      range = document.createRange()
+      sel = window.getSelection()
+      if el.childNodes.length > 0
+        el2 = el.childNodes[el.childNodes.length - 1]
+        range.setStartAfter(el2)
+      else
+        range.setStartAfter(el)
+      range.collapse(true)
+      sel.removeAllRanges()
+      sel.addRange(range)
       null
 
     null