feat(context-pad): pass mouse position to the popup menu

Closes #414

lib/features/context-pad/ContextPadProvider.js

@@ -241,7 +241,9 @@ ContextPadProvider.prototype.getContextPadEntries = function(element) {
         title: 'Change type',
         action: {
           click: function(event, element) {
-            replaceMenu.open(getReplaceMenuPosition(element));
+            replaceMenu.open(assign(getReplaceMenuPosition(element), {
+              cursor: { x: event.x, y: event.y }
+            }), element);
           }
         }
       }
@@ -317,4 +319,4 @@ function isEventType(eventBo, type, definition) {
   });
 
   return isType && isDefinition;
-}
+}