src/vs/workbench/contrib/notebook/browser/view/cellPart.ts/CellPartsCollection/unrenderCell
class CellPartsCollection:	unrenderCell(element: ICellViewModel): void {
		for (const part of this.contentParts) {
			part.unrenderCell(element);
		}

		this._scheduledOverlayRendering.value = undefined;
		this._scheduledOverlayUpdateState.value = undefined;
		this._scheduledOverlayUpdateExecutionState.value = undefined;

		for (const part of this.overlayParts) {
			part.unrenderCell(element);
		}
	}