src/vs/editor/browser/viewParts/scrollDecoration/scrollDecoration.ts/ScrollDecorationViewPart/onConfigurationChanged
class ScrollDecorationViewPart:	public override onConfigurationChanged(e: viewEvents.ViewConfigurationChangedEvent): boolean {
		const options = this._context.configuration.options;
		const scrollbar = options.get(EditorOption.scrollbar);
		this._useShadows = scrollbar.useShadows;
		this._updateWidth();
		this._updateShouldShow();
		return true;
	}