Remove parent data from child scope

[adityasharat]

We should not insert parent data into a child scope. This will leak the parent data into the child scope, and also breaks the layout-data interface. Removing this will also improve performance by avoiding the copying loop per scope object.

Data

{
  "user": {
    "dt": "2017 04 22",
    "ll": "01, XZY, AB"
  }
}

Layout

{
  "type": "TextView",
  "layout_width": "wrap_content",
  "layout_height": "wrap_content",
  "textSize": "14sp",
  "data": {
    "date": "@{fn:date(@{user.dt},'E, d MMM')}"
  },
  "text": "@{fn:format('last login: %s from %s',@{date},@{user.ll})}"
}

Here in the layout user.ll is not added to the data scope of the layout and is only accessible from the outer scope. user.ll should be added to the data scope instead. As follows:

{
"type": "TextView",
"layout_width": "wrap_content",
"layout_height": "wrap_content",
"textSize": "14sp",
"data": {
"date": "@{fn:date(@{user.dt},'E, d MMM')}",
"loc": "@{user.ll}"
},
"text": "@{fn:format('last login: %s from %s',@{date},@{loc})}"
}