setHighlight (highlight) {
    if (this.dom.tr) {
      if (highlight) {
        addClassName(this.dom.tr, 'jsoneditor-highlight')
      } else {
        removeClassName(this.dom.tr, 'jsoneditor-highlight')
      }

      if (this.append) {
        this.append.setHighlight(highlight)
      }

      if (this.childs) {
        this.childs.forEach(child => {
          child.setHighlight(highlight)
        })
      }
    }
  }
Set highlighting for this node and all its childs.
Only applied to the currently visible (expanded childs)
@param {boolean} highlight