What is the use of title in visState of visualization saved-object

[Riddhesh]

I'm using kibana 6.3.1, and have a visualization saved-object:

{
  "type": "visualization",
  "updated_at": "2019-01-16T11:32:52.531Z",
  "visualization": {
    "title": "My Pie chart",
    "visState": "{\"title\":\"My Pie chart\",\"type\":...}",
    "uiStateJSON": "{}",
    "description": "",
    "savedSearchId": "0b39a6f0-f260-11e8-bb77-7981feeefd13",
    "version": 1,
    "kibanaSavedObjectMeta": {
      "searchSourceJSON": "{\"filter\":[],\"query\":{\"query\":\"\",\"language\":\"lucene\"}}"
    }
  }
}

What is the use of title inside visState which is same as outer title? If I change it, then nothing changes in visualization, and no error is thrown. So what is the use of it? And does it need to be always same as outer title?

[joshdover]

Looking through the Kibana source code it looks like this is typically kept in sync with the outer title field, though this could change in future versions I may be of more help if you could explain what you were trying to accomplish.

[Riddhesh]

Thanks for the reply.
I am creating a page similar to managing kibana saved-objects, where we can edit the json. In kibana's management tab(/app/kibana#/management/kibana/objects) if I change the outer title and save, it doesn't change the inner title. But editing title from visualize tab(/app/kibana#/visualize/edit) changes the inner title as well as you said. Which got me confused that does it need to be same or not and where is it used.