A question's indent property value is not applied to Matrices within a design surface

[JaneSjs]

User Issue: T15061 - The "Layout->Add indents" option in the Dynamic Matrix does not work https://surveyjs.answerdesk.io/internal/ticket/details/T15061

---

A question's indent property is not applied within a survey creator's design surface:

{
 "logoPosition": "right",
 "pages": [
  {
   "name": "page1",
   "elements": [
    {
     "type": "text",
     "name": "question1",
     "indent": 3
    },
    {
     "type": "matrixdropdown",
     "name": "question2",
     "indent": 3,
     "columns": [
      {
       "name": "Column 1"
      },
      {
       "name": "Column 2"
      },
      {
       "name": "Column 3"
      }
     ],
     "choices": [
      1,
      2,
      3,
      4,
      5
     ],
     "rows": [
      "Row 1",
      "Row 2"
     ]
    },
    {
     "type": "matrixdynamic",
     "name": "question3",
     "indent": 3,
     "columns": [
      {
       "name": "Column 1"
      },
      {
       "name": "Column 2"
      },
      {
       "name": "Column 3"
      }
     ],
     "choices": [
      1,
      2,
      3,
      4,
      5
     ]
    }
   ]
  }
 ]
}

However, this property works in a form library: https://codesandbox.io/s/adoring-sammet-gx4tgk?file=/src/json.js.