constructor(startLineNumber, endLineNumber, className, tooltip, zIndex) {
        this.startLineNumber = startLineNumber;
        this.endLineNumber = endLineNumber;
        this.className = className;
        this.tooltip = tooltip;
        this._decorationToRenderBrand = undefined;
        this.zIndex = zIndex !== null && zIndex !== void 0 ? zIndex : 0;
    }
Represents a decoration that should be shown along the lines from `startLineNumber` to `endLineNumber`.
This can end up producing multiple `LineDecorationToRender`.