src/vs/editor/common/services/markerDecorationsService.ts/MarkerDecorations/getMarkers
class MarkerDecorations:	getMarkers(): [Range, IMarker][] {
		const res: [Range, IMarker][] = [];
		this._markersData.forEach((marker, id) => {
			const range = this.model.getDecorationRange(id);
			if (range) {
				res.push([range, marker]);
			}
		});
		return res;
	}