src/vs/editor/browser/viewParts/minimap/minimap.ts/InnerMinimap/_getMinimapDomNodeClassName
class InnerMinimap:	private _getMinimapDomNodeClassName(): string {
		if (this._model.options.showSlider === 'always') {
			return 'minimap slider-always';
		}
		return 'minimap slider-mouseover';
	}