src/vs/editor/browser/viewParts/overviewRuler/overviewRuler.ts/OverviewRuler/onScrollChanged
class OverviewRuler:	public override onScrollChanged(e: viewEvents.ViewScrollChangedEvent): boolean {
		if (e.scrollHeightChanged) {
			this._zoneManager.setOuterHeight(e.scrollHeight);
			this._render();
		}
		return true;
	}