src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/_backgroundMarkdownRendering
class NotebookEditorWidget:	private _backgroundMarkdownRendering() {
		if (this._isScheduled) {
			return;
		}

		runWhenIdle((deadline) => {
			this._isScheduled = false;
			this._backgroundMarkdownRenderingWithDeadline(deadline);
		});
	}