src/vs/workbench/contrib/notebook/common/notebookOptions.ts/NotebookOptions/setCellBreakpointMarginActive
class NotebookOptions:	setCellBreakpointMarginActive(active: boolean) {
		this._layoutConfiguration.cellBreakpointMarginActive = active;
		this._onDidChangeOptions.fire({ cellBreakpointMargin: true });
	}