src/vs/editor/browser/widget/diffEditorWidget.ts/DiffEditorWidget/_layoutOverviewRulers
class DiffEditorWidget:	private _layoutOverviewRulers(): void {
		if (!this._options.renderOverviewRuler) {
			return;
		}

		if (!this._originalOverviewRuler || !this._modifiedOverviewRuler) {
			return;
		}
		const height = this._elementSizeObserver.getHeight();
		const reviewHeight = this._getReviewHeight();

		const freeSpace = DiffEditorWidget.ENTIRE_DIFF_OVERVIEW_WIDTH - 2 * DiffEditorWidget.ONE_OVERVIEW_WIDTH;
		const layoutInfo = this._modifiedEditor.getLayoutInfo();
		if (layoutInfo) {
			this._originalOverviewRuler.setLayout({
				top: 0,
				width: DiffEditorWidget.ONE_OVERVIEW_WIDTH,
				right: freeSpace + DiffEditorWidget.ONE_OVERVIEW_WIDTH,
				height: (height - reviewHeight)
			});
			this._modifiedOverviewRuler.setLayout({
				top: 0,
				right: 0,
				width: DiffEditorWidget.ONE_OVERVIEW_WIDTH,
				height: (height - reviewHeight)
			});
		}
	}