src/vs/workbench/api/browser/mainThreadEditor.ts/MainThreadTextEditor/setDecorationsFast
class MainThreadTextEditor:	public setDecorationsFast(key: string, _ranges: number[]): void {
		if (!this._codeEditor) {
			return;
		}
		const ranges: Range[] = [];
		for (let i = 0, len = Math.floor(_ranges.length / 4); i < len; i++) {
			ranges[i] = new Range(_ranges[4 * i], _ranges[4 * i + 1], _ranges[4 * i + 2], _ranges[4 * i + 3]);
		}
		this._codeEditor.setDecorationsByTypeFast(key, ranges);
	}