src/vs/workbench/contrib/notebook/browser/viewModel/baseCellViewModel.ts/BaseCellViewModel/removeModelDecoration
class BaseCellViewModel:	removeModelDecoration(decorationId: string) {
		const realDecorationId = this._resolvedDecorations.get(decorationId);

		if (this._textEditor && realDecorationId && realDecorationId.id !== undefined) {
			this._textEditor.deltaDecorations([realDecorationId.id!], []);
		}

		// lastly, remove all the cache
		this._resolvedDecorations.delete(decorationId);
	}