src/vs/workbench/contrib/notebook/browser/view/renderers/cellContextKeys.ts/CellContextKeyManager/updateForCollapseState
class CellContextKeyManager:	private updateForCollapseState() {
		this.cellContentCollapsed.set(!!this.element.metadata.inputCollapsed);
		this.cellOutputCollapsed.set(!!this.element.metadata.outputCollapsed);
	}