Reduce survey value changed on adding new panel in dynamic panel with complex calculations

[andrewtelnov]

The following JSON will produce call survey setValue function 2 times on adding the first panel, 4 times on adding the second panel and so on:

{
    questions: [
      {
        name: "question1",
        type: "paneldynamic",
        templateElements: [
          { type: "expression", name: "q5", expression: "{panel.q4} + {panel.q3}" },
          { type: "text", name: "q1", defaultValue: 1 },
          { type: "text", name: "q2", defaultValue: 2 },
          { type: "text", name: "q3", defaultValueExpression: "{panel.q1} + {panel.q2}" },
          { type: "text", name: "q4", defaultValueExpression: "{val1}" }
        ]
      }
    ],
  }

The reason, because "q5" that will be caclulated at first depends on questions that calcualted later. As result q5 in the panel will be caclulated correctly after a new panel will be added, triggers by changing the dynamic panel "question1" value.
It will be better for performance, if we caclulate "q5" correctly at the first time.