src/vs/workbench/contrib/notebook/browser/view/cellParts/cellContextKeys.ts/CellContextKeyManager/updateForEditState
class CellContextKeyManager:	private updateForEditState() {
		if (!this.element) {
			return;
		}

		if (this.element instanceof MarkupCellViewModel) {
			this.markdownEditMode.set(this.element.getEditState() === CellEditState.Editing);
		} else {
			this.markdownEditMode.set(false);
		}
	}