src/vs/workbench/contrib/notebook/browser/diff/notebookDiffOverviewRuler.ts/NotebookDiffOverviewRuler/_layoutNow
class NotebookDiffOverviewRuler:	private _layoutNow() {
		const layoutInfo = this.notebookEditor.getLayoutInfo();
		const height = layoutInfo.height;
		const scrollHeight = layoutInfo.scrollHeight;
		const ratio = browser.PixelRatio.value;
		this._domNode.setWidth(this.width);
		this._domNode.setHeight(height);
		this._domNode.domNode.width = this.width * ratio;
		this._domNode.domNode.height = height * ratio;
		const ctx = this._domNode.domNode.getContext('2d')!;
		ctx.clearRect(0, 0, this.width * ratio, height * ratio);
		this._renderCanvas(ctx, this.width * ratio, height * ratio, scrollHeight * ratio, ratio);
		this._renderOverviewViewport();
	}