Verifies that Overlay.setShowIsolatedElements works.
Overlay not rendered:

Overlay rendered:
{
  "name": "drawIsolatedElementHighlight",
  "data": {
    "currentX": 8,
    "currentY": 8,
    "widthResizerBorder": [
      "M",
      408,
      8,
      "L",
      428,
      8,
      "L",
      428,
      508,
      "L",
      408,
      508,
      "Z"
    ],
    "heightResizerBorder": [
      "M",
      8,
      508,
      "L",
      408,
      508,
      "L",
      408,
      528,
      "L",
      8,
      528,
      "Z"
    ],
    "bidirectionResizerBorder": [
      "M",
      408,
      508,
      "L",
      428,
      508,
      "L",
      428,
      528,
      "L",
      408,
      528,
      "Z"
    ],
    "currentWidth": 400,
    "currentHeight": 500,
    "isolationModeHighlightConfig": {
      "resizerColor": "rgb(0, 0, 0)",
      "resizerHandleColor": "rgb(0, 0, 0)",
      "maskColor": "rgb(0, 0, 0)"
    },
    "highlightIndex": 0
  }
}