src/vs/workbench/contrib/notebook/browser/diff/diffComponents.ts/PropertyHeader/_updateFoldingIcon
class PropertyHeader:	private _updateFoldingIcon() {
		if (this.accessor.getFoldingState(this.cell) === PropertyFoldingState.Collapsed) {
			DOM.reset(this._foldingIndicator, renderIcon(collapsedIcon));
			this._propertyExpanded?.set(false);
		} else {
			DOM.reset(this._foldingIndicator, renderIcon(expandedIcon));
			this._propertyExpanded?.set(true);
		}

	}